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y in (-oo:+oo)
4*y-(4/5) = -3*y // + -3*y
4*y-(-3*y)-(4/5) = 0
4*y+3*y-4/5 = 0
7*y-4/5 = 0 // + 4/5
7*y = 4/5 // : 7
y = 4/5/7
y = 4/35
y = 4/35
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