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y in (-oo:+oo)
(4/5)*(4*y-3) = -28 // + 28
(4/5)*(4*y-3)+28 = 0
4/5*(4*y-3)+28 = 0
4/5*(4*y-3)+28 = 0
16/5*y+128/5 = 0
16/5*y+128/5 = 0
16/5*y+128/5 = 0 // - 128/5
16/5*y = -128/5 // : 16/5
y = -128/5/16/5
y = -8
y = -8
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