D. x=40
EXPLANATION:
Simplifying
4(0.2x + -5) = 12
Reorder the terms:
4(-5 + 0.2x) = 12
(-5 * 4 + 0.2x * 4) = 12
(-20 + 0.8x) = 12
Solving
-20 + 0.8x = 12
Solving for variable x
Move all terms containing x to the left, all other terms to the right.
Add 20 to each side of the equation.
-20 + 20 + 0.8x = 12 + 20
Combine like terms: -20 + 20 = 0
0 + 0.8x = 12 + 20
0.8x = 12 + 20
Combine like terms: 12 + 20 = 32
0.8x = 32
Divide each side by '0.8'.
x = 40
Simply
x=40
Answer: x=40
