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90=3y+0.5
We move all terms to the left:
90-(3y+0.5)=0
We get rid of parentheses
-3y-0.5+90=0
We add all the numbers together, and all the variables
-3y+89.5=0
We move all terms containing y to the left, all other terms to the right
-3y=-89.5
y=-89.5/-3
y=29+2.5/3
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