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y in (-oo:+oo)
(7*y-3)/8 = -4 // + 4
(7*y-3)/8+4 = 0
(7*y-3)/8+(4*8)/8 = 0
7*y+4*8-3 = 0
7*y+29 = 0
(7*y+29)/8 = 0
(7*y+29)/8 = 0 // * 8
7*y+29 = 0
7*y+29 = 0 // - 29
7*y = -29 // : 7
y = -29/7
y = -29/7
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