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y in (-oo:+oo)
(-3*y)/(-3) = 25/(-3) // - 25/(-3)
(-3*y)/(-3)-(25/(-3)) = 0
(-3*y)/(-3)+25/3 = 0
y+25/3 = 0 // - 25/3
y = -25/3
y = -25/3
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