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10-7y=-9y
We move all terms to the left:
10-7y-(-9y)=0
We get rid of parentheses
-7y+9y+10=0
We add all the numbers together, and all the variables
2y+10=0
We move all terms containing y to the left, all other terms to the right
2y=-10
y=-10/2
y=-5
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