-14 = (x + 12)/-6
The first step to solving this is the multiply both sides by -6 to get rid of the denominator. Also remember that when multiplying two negative numbers, they cancel out and you get a positive product.
-14(-6) = -6(x + 12)/-6
84 = x + 12
Now the only thing left to do is subtract 12 from both sides to isolate the x.
x = 72
The answer is x = 72.