Answer:
x=-4
Step-by-step explanation:
First, you would simplify the like terms on both sides of the equation to get 42 + 12x = -8.5x - 40
Second, you would want to add and subtract terms to get the X's on one side, and the whole numbers on the other.
12x + 8.5x = -40-42
Third, simply the terms.
20.5x=-82
Fourth, divide both sides by 20.5 to get the x on its own, and then you will have your answer of x=4.
