Question

15x - 10= 6x - (x+2) + ( -x + 3)

Answer 1

$15x-10=6x-x-2-x+3 15x-6x+x+x= 10-2+3 11x=11 \\ x=1$

Answer 2

15x - 10 = 6x - (x + 2) + ( - x + 3)

15x - 10 = 6x - x - 2 - x + 3

15x - 10 = 6x - x - x - 2 + 3

15x - 10 = 6x - 2x - 2 + 3

15x - 10 = 4x + 1

15x - 4x = 1 + 10

11x = 11

x = 11/11

x = 1

Solución : 

x = 1