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(9y+4)+(2y+8)=78
We move all terms to the left:
(9y+4)+(2y+8)-(78)=0
We get rid of parentheses
9y+2y+4+8-78=0
We add all the numbers together, and all the variables
11y-66=0
We move all terms containing y to the left, all other terms to the right
11y=66
y=66/11
y=6
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