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y in (-oo:+oo)
9/4-12 = (1/4)*y-4 // - (1/4)*y-4
9/4-((1/4)*y)-12+4 = 0
(-1/4)*y+9/4-12+4 = 0
-1/4*y-23/4 = 0 // + 23/4
-1/4*y = 23/4 // : -1/4
y = 23/4/(-1/4)
y = -23
y = -23
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