Question

Por favor me ajudem

10(x-- 1) - 7 (x+1)= 4

Answer 1

10.(x-1)-7.(x+1)=4
10x-10-7x-7=4
10x-7x=4+7+10
3x=21
x=21/3
x=7

Answer 2

10(x - 1) -7(x + 1) = 4

10x - 10 - 7x - 7 = 4

3x - 17 = 4

3x = 4 + 17

3x= 21

x= 21/3

x=7