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(y=7)(3+4y)
We move all terms to the left:
(y-(7)(3+4y))=0
We add all the numbers together, and all the variables
(y-7(4y+3))=0
We calculate terms in parentheses: +(y-7(4y+3)), so:We get rid of parentheses
y-7(4y+3)
We multiply parentheses
y-28y-21
We add all the numbers together, and all the variables
-27y-21
Back to the equation:
+(-27y-21)
-27y-21=0
We move all terms containing y to the left, all other terms to the right
-27y=21
y=21/-27
y=-7/9
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