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9y-13=-2(y+1)
We move all terms to the left:
9y-13-(-2(y+1))=0
We calculate terms in parentheses: -(-2(y+1)), so:We get rid of parentheses
-2(y+1)
We multiply parentheses
-2y-2
Back to the equation:
-(-2y-2)
9y+2y+2-13=0
We add all the numbers together, and all the variables
11y-11=0
We move all terms containing y to the left, all other terms to the right
11y=11
y=11/11
y=1
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