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y in (-oo:+oo)
(4/5)*(10*y-15) = 20 // - 20
(4/5)*(10*y-15)-20 = 0
4/5*(10*y-15)-20 = 0
4/5*(10*y-15)-20 = 0
8*y-32 = 0
8*y-32 = 0
8*y-32 = 0 // + 32
8*y = 32 // : 8
y = 32/8
y = 4
y = 4
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