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