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-90+-45=-90x+45
We move all terms to the left:
-90+-45-(-90x+45)=0
We add all the numbers together, and all the variables
-(-90x+45)=0
We get rid of parentheses
90x-45=0
We move all terms containing x to the left, all other terms to the right
90x=45
x=45/90
x=1/2
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