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-9x+13x*53=91
We move all terms to the left:
-9x+13x*53-(91)=0
Wy multiply elements
-9x+689x-91=0
We add all the numbers together, and all the variables
680x-91=0
We move all terms containing x to the left, all other terms to the right
680x=91
x=91/680
x=91/680
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