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90-x=2x-10
We move all terms to the left:
90-x-(2x-10)=0
We add all the numbers together, and all the variables
-1x-(2x-10)+90=0
We get rid of parentheses
-1x-2x+10+90=0
We add all the numbers together, and all the variables
-3x+100=0
We move all terms containing x to the left, all other terms to the right
-3x=-100
x=-100/-3
x=33+1/3
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