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y in (-oo:+oo)
(7*(y-2))/4 = -2*y // + -2*y
(7*(y-2))/4-(-2*y) = 0
(7*(y-2))/4+2*y = 0
(7*(y-2))/4+(2*4*y)/4 = 0
7*(y-2)+2*4*y = 0
15*y-14 = 0
(15*y-14)/4 = 0
(15*y-14)/4 = 0 // * 4
15*y-14 = 0
15*y-14 = 0 // + 14
15*y = 14 // : 15
y = 14/15
y = 14/15
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