Answer: x = - 21
Step-by-step explanation:
7-2(x)-2(-10)=15
7-2x - (2*10) =
7 - 2x - 20 =
7 - 20 -2x =
-27 - 2x = 15 ;
↔ -2x + (-27) =
-2x - 27 = 15 ;
-1 ( -2x -27) = 15 *(-1)
2x + 27 = -15 ;
2x + 27 - 27 = -15 -27 ;
2x = -42 ;
2x / 2 = - 42/2 ;
x = -21 .
