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9(5-x)=81.
We move all terms to the left:
9(5-x)-(81.)=0
We add all the numbers together, and all the variables
9(-1x+5)-81=0
We multiply parentheses
-9x+45-81=0
We add all the numbers together, and all the variables
-9x-36=0
We move all terms containing x to the left, all other terms to the right
-9x=36
x=36/-9
x=-4
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