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-9(x-10)=81
We move all terms to the left:
-9(x-10)-(81)=0
We multiply parentheses
-9x+90-81=0
We add all the numbers together, and all the variables
-9x+9=0
We move all terms containing x to the left, all other terms to the right
-9x=-9
x=-9/-9
x=1
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