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f in (-oo:+oo)
(15*f)/28-((9*f)/14) = 9/7 // - 9/7
(15*f)/28-((9*f)/14)-(9/7) = 0
(15*f)/28+(-9/14)*f-9/7 = 0
-3/28*f-9/7 = 0 // + 9/7
-3/28*f = 9/7 // : -3/28
f = 9/7/(-3/28)
f = -12
f = -12
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