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y in (-oo:+oo)
y/15-(y/6) = 3 // - 3
y/15-(y/6)-3 = 0
-1/10*y-3 = 0 // + 3
-1/10*y = 3 // : -1/10
y = 3/(-1/10)
y = -30
y = -30
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