Question

quero a soma e a resultado dessa conta -3X+20=x-10

Answer 1

-3x+20=x-10
20+10=x+3x
30=4x
x=30/4=7,5

Answer 2

-3X+20=x-10
-3x-x=-10 -20
-4x= -30        .(-1)
4x= 30
x= $\frac{30}{4}$
x= 7,5