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y in (-oo:+oo)
y/10+9 = y/4+18 // - y/4+18
y/10-(y/4)-18+9 = 0
-3/20*y-9 = 0 // + 9
-3/20*y = 9 // : -3/20
y = 9/(-3/20)
y = -60
y = -60
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