Answer:
x = 2
distributive property of equality, subtraction property of equality, and division property of equality
Step-by-step explanation:
(Proof is in parenthesis)
4(x + 3) = 20 (Given)
4x + 12 = 20 (distributive property of equality)
4x = 8 (subtraction property of equality)
x = 2 (division property of equality)