What is the solution of equation 3x + y = 90 2x + y = 60

3x+y=90 ①
2x+y=60 ②
① (2) yes
x=30
Substituting (1) yes
y=0
So x = 30, y = 0

4 * (6x + 3) = 60 2x + 23 * 4 = 134 (3x-4) * 5 = 4 solve the following equation

（3x-4）X5＝4
15x-20＝4
15x＝24
x＝8/5

The solution of the equation | 3x-1 | = | 2x + 1 | is

|3x-1|=|2x+1|
(3x-1)^2=(2x+1)^2
9x^2-6x+1=4x^2+4x+1
5x^2-10x=0
5x(x-2)=0
x1=0 ,x2=2
It's not easy to fight by hand,

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