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y in (-oo:+oo)
18/30 = y/4 // - y/4
18/30-(y/4) = 0
3/5-1/4*y = 0 // - 3/5
-1/4*y = -3/5 // : -1/4
y = -3/5/(-1/4)
y = 12/5
y = 12/5
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