Question

alguem me ajuda ?10(x-1)-7(x+1)=4

Answer 1

$10(x-1)-7(x+1)=4 \\ 10x - 10 - 7x - 7 =4 \\ 10x -7x = 4 + 10 + 7 \\ 3x=21\\ x = \frac{21}{3} \\ \\ x = 7$

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