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7x+2(2x+6)=144
We move all terms to the left:
7x+2(2x+6)-(144)=0
We multiply parentheses
7x+4x+12-144=0
We add all the numbers together, and all the variables
11x-132=0
We move all terms containing x to the left, all other terms to the right
11x=132
x=132/11
x=12
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