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28=(7y-4)+(7y+5)
We move all terms to the left:
28-((7y-4)+(7y+5))=0
We calculate terms in parentheses: -((7y-4)+(7y+5)), so:We get rid of parentheses
(7y-4)+(7y+5)
We get rid of parentheses
7y+7y-4+5
We add all the numbers together, and all the variables
14y+1
Back to the equation:
-(14y+1)
-14y-1+28=0
We add all the numbers together, and all the variables
-14y+27=0
We move all terms containing y to the left, all other terms to the right
-14y=-27
y=-27/-14
y=1+13/14
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