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y in (-oo:+oo)
0.75*(y+3*y) = (4/5)*(y-5) // - (4/5)*(y-5)
0.75*(y+3*y)-((4/5)*(y-5)) = 0
0.75*(y+3*y)+(-4/5)*(y-5) = 0
0.75*4*y-4/5*(y-5) = 0
0.75*4*y-4/5*(y-5) = 0
11/5*y+4 = 0
11/5*y+4 = 0
11/5*y+4 = 0 // - 4
11/5*y = -4 // : 11/5
y = -4/11/5
y = -20/11
y = -20/11
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