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-10x+90=-21x+2
We move all terms to the left:
-10x+90-(-21x+2)=0
We get rid of parentheses
-10x+21x-2+90=0
We add all the numbers together, and all the variables
11x+88=0
We move all terms containing x to the left, all other terms to the right
11x=-88
x=-88/11
x=-8
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