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y in (-oo:+oo)
(7*(y-4))/2 = -3*y // + -3*y
(7*(y-4))/2-(-3*y) = 0
(7*(y-4))/2+3*y = 0
(7*(y-4))/2+(2*3*y)/2 = 0
7*(y-4)+2*3*y = 0
13*y-28 = 0
(13*y-28)/2 = 0
(13*y-28)/2 = 0 // * 2
13*y-28 = 0
13*y-28 = 0 // + 28
13*y = 28 // : 13
y = 28/13
y = 28/13
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