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y in (-oo:+oo)
3*y-(4/5) = (1/3)*y // - (1/3)*y
3*y-((1/3)*y)-(4/5) = 0
3*y+(-1/3)*y-4/5 = 0
8/3*y-4/5 = 0 // + 4/5
8/3*y = 4/5 // : 8/3
y = 4/5/8/3
y = 3/10
y = 3/10
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