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90=4y-7
We move all terms to the left:
90-(4y-7)=0
We get rid of parentheses
-4y+7+90=0
We add all the numbers together, and all the variables
-4y+97=0
We move all terms containing y to the left, all other terms to the right
-4y=-97
y=-97/-4
y=24+1/4
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