Question

x+21
-------- =x-9
3

Answer 1

Respuesta:

$\frac{x + 21}{3} = x - 9 \\ 3( \frac{x + 21}{3} ) = 3(x - 9) \\ x + 21 = 3x - 27 \\ 21 + 27 = 3x - x \\ 48 = 2x \\ 24 = x$