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