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y in (-oo:+oo)
y/5+6 = y/2+12 // - y/2+12
y/5-(y/2)-12+6 = 0
-3/10*y-6 = 0 // + 6
-3/10*y = 6 // : -3/10
y = 6/(-3/10)
y = -20
y = -20
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