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10+2x=90+x
We move all terms to the left:
10+2x-(90+x)=0
We add all the numbers together, and all the variables
2x-(x+90)+10=0
We get rid of parentheses
2x-x-90+10=0
We add all the numbers together, and all the variables
x-80=0
We move all terms containing x to the left, all other terms to the right
x=80
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