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(4*(y-7))/5 = -2*y // + -2*y
(4*(y-7))/5-(-2*y) = 0
(4*(y-7))/5+2*y = 0
(4*(y-7))/5+(2*5*y)/5 = 0
4*(y-7)+2*5*y = 0
14*y-28 = 0
(14*y-28)/5 = 0
(14*y-28)/5 = 0 // * 5
14*y-28 = 0
14*y-28 = 0 // + 28
14*y = 28 // : 14
y = 28/14
y = 2
y = 2
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