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90=9x+-3
We move all terms to the left:
90-(9x+-3)=0
We add all the numbers together, and all the variables
-(9x-3)+90=0
We get rid of parentheses
-9x+3+90=0
We add all the numbers together, and all the variables
-9x+93=0
We move all terms containing x to the left, all other terms to the right
-9x=-93
x=-93/-9
x=10+1/3
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