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-90x+45=45x-90
We move all terms to the left:
-90x+45-(45x-90)=0
We get rid of parentheses
-90x-45x+90+45=0
We add all the numbers together, and all the variables
-135x+135=0
We move all terms containing x to the left, all other terms to the right
-135x=-135
x=-135/-135
x=1
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