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30=-6y+4y+12
We move all terms to the left:
30-(-6y+4y+12)=0
We add all the numbers together, and all the variables
-(-2y+12)+30=0
We get rid of parentheses
2y-12+30=0
We add all the numbers together, and all the variables
2y+18=0
We move all terms containing y to the left, all other terms to the right
2y=-18
y=-18/2
y=-9
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