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91=1-9x
We move all terms to the left:
91-(1-9x)=0
We add all the numbers together, and all the variables
-(-9x+1)+91=0
We get rid of parentheses
9x-1+91=0
We add all the numbers together, and all the variables
9x+90=0
We move all terms containing x to the left, all other terms to the right
9x=-90
x=-90/9
x=-10
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