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-9y+30=-4y
We move all terms to the left:
-9y+30-(-4y)=0
We get rid of parentheses
-9y+4y+30=0
We add all the numbers together, and all the variables
-5y+30=0
We move all terms containing y to the left, all other terms to the right
-5y=-30
y=-30/-5
y=+6
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