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y in (-oo:+oo)
27-((3*y)/4) = 4.5 // - 4.5
27-((3*y)/4)-4.5 = 0
(-3/4)*y-4.5+27 = 0
22.5-3/4*y = 0 // - 22.5
-3/4*y = -22.5 // : -3/4
y = -22.5/(-3/4)
y = 30
y = 30
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