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f in (-oo:+oo)
(3*(f+2))/9 = 5*f+13 // - 5*f+13
(3*(f+2))/9-(5*f)-13 = 0
(3*(f+2))/9-5*f-13 = 0
(3*(f+2))/9+(-5*9*f)/9+(-13*9)/9 = 0
3*(f+2)-5*9*f-13*9 = 0
6-42*f-117 = 0
-42*f-111 = 0
(-42*f-111)/9 = 0
(-42*f-111)/9 = 0 // * 9
-42*f-111 = 0
-42*f-111 = 0 // + 111
-42*f = 111 // : -42
f = 111/(-42)
f = -37/14
f = -37/14
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