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-1=-7y+3(y-7)
We move all terms to the left:
-1-(-7y+3(y-7))=0
We calculate terms in parentheses: -(-7y+3(y-7)), so:We get rid of parentheses
-7y+3(y-7)
We multiply parentheses
-7y+3y-21
We add all the numbers together, and all the variables
-4y-21
Back to the equation:
-(-4y-21)
4y+21-1=0
We add all the numbers together, and all the variables
4y+20=0
We move all terms containing y to the left, all other terms to the right
4y=-20
y=-20/4
y=-5
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