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10=91-4x-5x
We move all terms to the left:
10-(91-4x-5x)=0
We add all the numbers together, and all the variables
-(-9x+91)+10=0
We get rid of parentheses
9x-91+10=0
We add all the numbers together, and all the variables
9x-81=0
We move all terms containing x to the left, all other terms to the right
9x=81
x=81/9
x=9
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