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7(13-2)-9(x-10)=0
We add all the numbers together, and all the variables
-9(x-10)+711=0
We multiply parentheses
-9x+90+711=0
We add all the numbers together, and all the variables
-9x+801=0
We move all terms containing x to the left, all other terms to the right
-9x=-801
x=-801/-9
x=+89
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