12-3x=15 — step-by-step solution

⚠ 3x is read as the product 3*x: for a power, write 3^x

Let's solve in

ℝ

12 - 3 x = 15

12 - 15 = 3 x

-3 = 3 x

x = - \frac{3}{3}

▶Solution obtained:

x = -1