3x + 20% x = 80 to solve the equation

3x + 20% x = 80 to solve the equation

x(3+0.2)=80
3.2x=80
x=25

The solution equation: X / 40 - (1 / 3x / 40 + 2 / 3x / 80) = 1 / 2 + 1 / 4

Multiply by 80:2x - (2 / 3x + 2 / 3x) = 40 + 20
Multiply by 3:6x-4x = 180
Merge the similar items and calculate the result: x = 90

Solve the equation 120-3x = 90 1-40% x = 80%

3x=120-90
3x=30
x=10
1-80%=40%x
40%x=20%
x=1/2

48% X-12% x = 36 solution equation

48%X-12%X=36
0.48x-0.12x=36
0.36x=36
x=100

What is 1 / x = 5 / x + 3?

-4/3

cos20°×cos40°×cos80°=______

cos20°cos40°cos80°
=8sin20°cos20°cos40°cos80°/(8sin20°)
=4sin40°cos40°cos80°/(8sin20°)
=2sin80°cos80°/(8sin20°)
=sin160°/(8sin20°)
=sin20°/(8sin20°)
=1/8

12 (x + 1) = 7 (Y-1) write out any three solutions of the equation

x=6 y=13
x=13 y=25
x=20 y=37

What's one percent plus five percent equal to twelve? What's eleven percent plus thirty-six percent equal to twelve?
It must be the simplest fraction

One in six plus five in twelve is seven in twelve
11 out of 12 plus 3 out of 36 is 12 out of 12

(8x-50)÷3=（10x+40）÷5+10

1. Go to the denominator and multiply 15 on both sides to get 5 (8x-50) = 3 (10x + 40) + 150
2. Remove the brackets: 40x-250 = 30x + 120 + 150
3. Transfer: 40x-30x = 250 + 120 + 150
4. Combining the similar items: 10x = 520
5.X=520*10
x=52
This is the way to solve the equation
I don't know anything else

How much is cos70 by cos40 + sin70 by sin40
Thank you very much. It's better to be more detailed

Formula
cos（a-b）=cosacosb+sinasinb
Original formula = cos (70-40) = cos30 = √ 3 / 2