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(6y+3)+(4y-3)=90
We move all terms to the left:
(6y+3)+(4y-3)-(90)=0
We get rid of parentheses
6y+4y+3-3-90=0
We add all the numbers together, and all the variables
10y-90=0
We move all terms containing y to the left, all other terms to the right
10y=90
y=90/10
y=9
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