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7x+3(3x+8)=136
We move all terms to the left:
7x+3(3x+8)-(136)=0
We multiply parentheses
7x+9x+24-136=0
We add all the numbers together, and all the variables
16x-112=0
We move all terms containing x to the left, all other terms to the right
16x=112
x=112/16
x=7
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