The first day of junior high school solves the equation exercise question and the answer 50 seek the answer!

The first day of junior high school solves the equation exercise question and the answer 50 seek the answer!

14x-7-12x+3=12x+8-1
2x-4=12x+7
-10x=11
X = - 11 / 10 (11 / 10)
(5y+1)+(1-y)=(9y+1)+(1-3y)
5y+2-y=9y+2-3y
5y-9y+2-2-y+3y=0
-4y+2y=0
-2y=0
y=0
20%+80%（320-x）=320×40%
20%+320（80%-40%）=80%x
1+320×2=4x
x=641/4
2(x-2)+2=x+1
4x-4+2=x+1
4x-3=x
x=1
（1）2—（1—y）=—2
2-1+y=--2
y=-2-2+1=-3
（2）5—（x—1）=3—3x
5-x+1=3-3x
2x=3-1-5
2x=-3
x=-1.5
(3) It's like this at 12:07:51 a.m. on March 19, 2014

3ax-b = 0 (a is not equal to 0)
3-mx = NX + 4 (M + n is not equal to 0)
(A-2) x-a-2 = 0 (a is not equal to 0)

Solution (1) 3ax-b = 0 (a is not equal to 0)
3ax=b
x=b/3a
Solution (2) 3-mx = NX + 4 (M + n is not equal to 0)
(m+n)x=-1
x=-1/(m+n)
Solution (3) (A-2) x-a-2 = 0 (a is not equal to 0)
(a-2)x=a+2
x=(a+2)/(a-2)

Ask 40 questions in Volume 1 of grade 5 (subtraction)
There are difficult, there are simple! Urgent

Sorry, I only have these: (1) 25 × 1.2 = 25 × (1 + 0.2) = 25 × 1 + 25 × 0.2 = 25 + 5 = 30 (2) 0.25 × 0.125 × 3.2 = (0.25 × 0.4) × (0.125 × 8) = 0.1 × 1 = 0.1 (3) 8.8 × 0.125 = 1.1 × (8 × 0.125) = 1.1 × 1 = 1.1 (4) 1 + 2 + 3 +. + 99 + 100 = (1 + 100)

In a Book of 98 pages, Zhang didn't finish it in 7 days, but Li didn't finish it in 7 days

You said Zhang didn't finish in seven days, Li didn't finish in seven days
You make me dizzy. Is it Li or Zhang who can see fast?
Suppose Li in your question reads faster, then the second condition is that Li reads 3 more pages than Zhang on average every day
So: let's assume that Li sees equation 7 (x-3) 98 on page x every day
The solution is 14