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90=10x+3+12x-1
We move all terms to the left:
90-(10x+3+12x-1)=0
We add all the numbers together, and all the variables
-(22x+2)+90=0
We get rid of parentheses
-22x-2+90=0
We add all the numbers together, and all the variables
-22x+88=0
We move all terms containing x to the left, all other terms to the right
-22x=-88
x=-88/-22
x=+4
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