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f in (-oo:+oo)
(1/2)*(6*f-4) = 4*f-9 // - 4*f-9
(1/2)*(6*f-4)-(4*f)+9 = 0
(1/2)*(6*f-4)-4*f+9 = 0
1/2*(6*f-4)-4*f+9 = 0
1/2*(6*f-4)-4*f+9 = 0
9-f-2 = 0
7-f = 0
7-f = 0
7-f = 0 // - 7
-f = -7 // * -1
f = 7
f = 7
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