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f in (-oo:+oo)
12-((1/4)*f) = 37 // - 37
12-((1/4)*f)-37 = 0
(-1/4)*f-37+12 = 0
-1/4*f-25 = 0 // + 25
-1/4*f = 25 // : -1/4
f = 25/(-1/4)
f = -100
f = -100
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