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y in (-oo:+oo)
(9/4)*y-12 = 0.25*y-4 // - 0.25*y-4
(9/4)*y-(0.25*y)-12+4 = 0
(9/4)*y-0.25*y-12+4 = 0
2*y-8 = 0 // + 8
2*y = 8 // : 2
y = 8/2
y = 4
y = 4
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