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3(9x)+2(9x+2)=216
We move all terms to the left:
3(9x)+2(9x+2)-(216)=0
We multiply parentheses
39x+18x+4-216=0
We add all the numbers together, and all the variables
57x-212=0
We move all terms containing x to the left, all other terms to the right
57x=212
x=212/57
x=3+41/57
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