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(3y+99)+(12y+9)=270
We move all terms to the left:
(3y+99)+(12y+9)-(270)=0
We get rid of parentheses
3y+12y+99+9-270=0
We add all the numbers together, and all the variables
15y-162=0
We move all terms containing y to the left, all other terms to the right
15y=162
y=162/15
y=10+4/5
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