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4(x+6)+5(x+6)=81
We move all terms to the left:
4(x+6)+5(x+6)-(81)=0
We multiply parentheses
4x+5x+24+30-81=0
We add all the numbers together, and all the variables
9x-27=0
We move all terms containing x to the left, all other terms to the right
9x=27
x=27/9
x=3
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