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(9y+3)+(2y+9)=90
We move all terms to the left:
(9y+3)+(2y+9)-(90)=0
We get rid of parentheses
9y+2y+3+9-90=0
We add all the numbers together, and all the variables
11y-78=0
We move all terms containing y to the left, all other terms to the right
11y=78
y=78/11
y=7+1/11
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