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y in (-oo:+oo)
(-4/5)*y+4 = -8 // + 8
(-4/5)*y+4+8 = 0
12-4/5*y = 0 // - 12
-4/5*y = -12 // : -4/5
y = -12/(-4/5)
y = 15
y = 15
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