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3(3x+6)+2(2x+5)=54
We move all terms to the left:
3(3x+6)+2(2x+5)-(54)=0
We multiply parentheses
9x+4x+18+10-54=0
We add all the numbers together, and all the variables
13x-26=0
We move all terms containing x to the left, all other terms to the right
13x=26
x=26/13
x=2
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