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90x+50=30+80
We move all terms to the left:
90x+50-(30+80)=0
We add all the numbers together, and all the variables
90x+50-110=0
We add all the numbers together, and all the variables
90x-60=0
We move all terms containing x to the left, all other terms to the right
90x=60
x=60/90
x=2/3
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