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90=10+25+x
We move all terms to the left:
90-(10+25+x)=0
We add all the numbers together, and all the variables
-(x+35)+90=0
We get rid of parentheses
-x-35+90=0
We add all the numbers together, and all the variables
-1x+55=0
We move all terms containing x to the left, all other terms to the right
-x=-55
x=-55/-1
x=+55
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