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y in (-oo:+oo)
-15 = y/3-5 // - y/3-5
5-(y/3)-15 = 0
-1/3*y-10 = 0 // + 10
-1/3*y = 10 // : -1/3
y = 10/(-1/3)
y = -30
y = -30
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