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7x+3(5x-6)=136
We move all terms to the left:
7x+3(5x-6)-(136)=0
We multiply parentheses
7x+15x-18-136=0
We add all the numbers together, and all the variables
22x-154=0
We move all terms containing x to the left, all other terms to the right
22x=154
x=154/22
x=7
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