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y in (-oo:+oo)
3*y-(4/5) = 0.3*y // - 0.3*y
3*y-(0.3*y)-(4/5) = 0
3*y-0.3*y-4/5 = 0
2.7*y-4/5 = 0 // + 4/5
2.7*y = 4/5 // : 2.7
y = 4/5/2.7
y = 0.2962963
y = 0.2962963
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