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-90-2x=10-10x
We move all terms to the left:
-90-2x-(10-10x)=0
We add all the numbers together, and all the variables
-2x-(-10x+10)-90=0
We get rid of parentheses
-2x+10x-10-90=0
We add all the numbers together, and all the variables
8x-100=0
We move all terms containing x to the left, all other terms to the right
8x=100
x=100/8
x=12+1/2
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