Question

2(x + 4) – 3(x – 4) = 15. Qual o valor de x?

Answer 1

2(x+4) -3(x-4) = 15
2(x)+2(4)-3(x)-3(-4) = 15
2x+8-3x+12 = 15
2x-3x+8+12 = 15
-x+20 = 15
-x = 15-20
-x = -5 
 x = 5

Answer 2

2 (x + 4) - 3 (x - 4) = 15
2x + 8 - 3x - 12 = 15
2x - 3x = 15 + 12 - 8
-x = 19