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3x+6(3x-7)=64
We move all terms to the left:
3x+6(3x-7)-(64)=0
We multiply parentheses
3x+18x-42-64=0
We add all the numbers together, and all the variables
21x-106=0
We move all terms containing x to the left, all other terms to the right
21x=106
x=106/21
x=5+1/21
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