Answer:
x = -3
Step-by-step explanation:
to solve the equation we will collect the like terms and evaluate
15 + 5x = -x-3
15 + 5x + x = -3
15 + 6x = -3
6x = -3 - 15
6x = -18
divide both side by the coefficient of x which is 6
6x/6 = -18/6
x = -3
to check if your answer is correct we will put the value of x = -3 into the equation and we will check if the right handside equals to the left handside.
15 + 6x = -3
15 + 6(-3) = -3
15 - 18 = -3
-3 = -3......................................................... proved
