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3x+4(3x-7)=113
We move all terms to the left:
3x+4(3x-7)-(113)=0
We multiply parentheses
3x+12x-28-113=0
We add all the numbers together, and all the variables
15x-141=0
We move all terms containing x to the left, all other terms to the right
15x=141
x=141/15
x=9+2/5
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