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12y+15=-5y-19
We move all terms to the left:
12y+15-(-5y-19)=0
We get rid of parentheses
12y+5y+19+15=0
We add all the numbers together, and all the variables
17y+34=0
We move all terms containing y to the left, all other terms to the right
17y=-34
y=-34/17
y=-2
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