Answer:
X=5 and a quarter
Step-by-step explanation:
21 + 21 = 4x + 4x
42 = 8x
8x = 42
x = 42/8
= 5 1/4
0
21 - 4x = 4x + 21
~Subtract 21 to both sides
-4x = 4x
~Divide -4 to both sides
x = -x
~Add 8 to both sides
2x = 0
~Divide 2 to both sides
x = 0
Best of Luck!
