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5(6+7x)=345
We move all terms to the left:
5(6+7x)-(345)=0
We add all the numbers together, and all the variables
5(7x+6)-345=0
We multiply parentheses
35x+30-345=0
We add all the numbers together, and all the variables
35x-315=0
We move all terms containing x to the left, all other terms to the right
35x=315
x=315/35
x=9
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