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y in (-oo:+oo)
y/5 = y/3-4 // - y/3-4
y/5-(y/3)+4 = 0
4-2/15*y = 0 // - 4
-2/15*y = -4 // : -2/15
y = -4/(-2/15)
y = 30
y = 30
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