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f in (-oo:+oo)
(1/2)*(2*f+10)+5 = (1/3)*(6*f-4) // - (1/3)*(6*f-4)
(1/2)*(2*f+10)-((1/3)*(6*f-4))+5 = 0
(1/2)*(2*f+10)+(-1/3)*(6*f-4)+5 = 0
1/2*(2*f+10)-1/3*(6*f-4)+5 = 0
1/2*(2*f+10)-1/3*(6*f-4)+5 = 0
5-f+19/3 = 0
34/3-f = 0
34/3-f = 0
34/3-f = 0 // - 34/3
-f = -34/3 // * -1
f = 34/3
f = 34/3
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