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y in (-oo:+oo)
27 = (3/4)*y // - (3/4)*y
27-((3/4)*y) = 0
(-3/4)*y+27 = 0
27-3/4*y = 0 // - 27
-3/4*y = -27 // : -3/4
y = -27/(-3/4)
y = 36
y = 36
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