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7(3x+6)+5(3x+6)=144
We move all terms to the left:
7(3x+6)+5(3x+6)-(144)=0
We multiply parentheses
21x+15x+42+30-144=0
We add all the numbers together, and all the variables
36x-72=0
We move all terms containing x to the left, all other terms to the right
36x=72
x=72/36
x=2
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