2-9f/5-f=20/15

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Solution for 2-9f/5-f=20/15 equation: 


f in (-oo:+oo)

2-((9*f)/5)-f = 20/15 // - 20/15

2-((9*f)/5)-f-(20/15) = 0

(-9/5)*f-f-4/3+2 = 0

2/3-14/5*f = 0 // - 2/3

-14/5*f = -2/3 // : -14/5

f = -2/3/(-14/5)

f = 5/21

f = 5/21

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