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y in (-oo:+oo)
(-2/5)*y = 15 // - 15
(-2/5)*y-15 = 0
-2/5*y-15 = 0 // + 15
-2/5*y = 15 // : -2/5
y = 15/(-2/5)
y = -75/2
y = -75/2
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