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90=4x+80
We move all terms to the left:
90-(4x+80)=0
We get rid of parentheses
-4x-80+90=0
We add all the numbers together, and all the variables
-4x+10=0
We move all terms containing x to the left, all other terms to the right
-4x=-10
x=-10/-4
x=2+1/2
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