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