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y in (-oo:+oo)
(-4/15)*y = -4/15 // + -4/15
(-4/15)*y-(-4/15) = 0
(-4/15)*y+4/15 = 0
4/15-4/15*y = 0 // - 4/15
-4/15*y = -4/15 // : -4/15
y = -4/15/(-4/15)
y = 1
y = 1
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