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