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y in (-oo:+oo)
(-2/5)*y+4 = 16 // - 16
(-2/5)*y-16+4 = 0
-2/5*y-12 = 0 // + 12
-2/5*y = 12 // : -2/5
y = 12/(-2/5)
y = -30
y = -30
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