(f-9)/3=(11-f)/5

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Solution for (f-9)/3=(11-f)/5 equation: 


f in (-oo:+oo)

(f-9)/3 = (11-f)/5 // - (11-f)/5

(f-9)/3-((11-f)/5) = 0

(f-9)/3+(-1*(11-f))/5 = 0

(5*(f-9))/(3*5)+(-1*3*(11-f))/(3*5) = 0

5*(f-9)-1*3*(11-f) = 0

8*f-78 = 0

(8*f-78)/(3*5) = 0

(8*f-78)/(3*5) = 0 // * 3*5

8*f-78 = 0

8*f-78 = 0 // + 78

8*f = 78 // : 8

f = 78/8

f = 39/4

f = 39/4

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