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y in (-oo:+oo)
((-3*1)/6)*y-18 = 72 // - 72
((-3*1)/6)*y-72-18 = 0
(-3/6)*y-72-18 = 0
-1/2*y-90 = 0 // + 90
-1/2*y = 90 // : -1/2
y = 90/(-1/2)
y = -180
y = -180
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