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x/2+x/2=90
We move all terms to the left:
x/2+x/2-(90)=0
We multiply all the terms by the denominator
x+x-90*2=0
We add all the numbers together, and all the variables
2x-180=0
We move all terms containing x to the left, all other terms to the right
2x=180
x=180/2
x=90
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