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f in (-oo:+oo)
3-((2*f-5)/6) = (3-f)/4 // - (3-f)/4
3-((2*f-5)/6)-((3-f)/4) = 0
(-1*(2*f-5))/6+(-1*(3-f))/4+3 = 0
(-1*4*(2*f-5))/(4*6)+(-1*6*(3-f))/(4*6)+(3*4*6)/(4*6) = 0
3*4*6-1*4*(2*f-5)-1*6*(3-f) = 0
2-2*f+72 = 0
74-2*f = 0
(74-2*f)/(4*6) = 0
(74-2*f)/(4*6) = 0 // * 4*6
74-2*f = 0
74-2*f = 0 // - 74
-2*f = -74 // : -2
f = -74/(-2)
f = 37
f = 37
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