Question

15x + 23 = -5x - 17 Qual a conta?

Answer 1

15x+5x=-17-23

20x=-40

x=-40/20

x=-2

Answer 2

$15x+23=-5x-17\\\\15x+23-23=-5x-17-23\\\\15x=-5x-40\\\\15x+5x=-5x-40+5x\\\\20x=-40\\\\\frac{20x}{20}=\frac{-40}{20}\\\\x=-2$