Answer:
x=42
Explanation:
180-12=168
168 divided by 4 = 42
x =42
(3x+12)+x=180
Combine like terms
4x +12 = 180
Subtract 12 from each side
4x +12-12=180-12
4x = 168
Divide by 4
4x/4 =168/4
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