(1/3)f+21=(1/2)f+18

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Solution for (1/3)f+21=(1/2)f+18 equation: 


f in (-oo:+oo)

(1/3)*f+21 = (1/2)*f+18 // - (1/2)*f+18

(1/3)*f-((1/2)*f)-18+21 = 0

(1/3)*f+(-1/2)*f-18+21 = 0

3-1/6*f = 0 // - 3

-1/6*f = -3 // : -1/6

f = -3/(-1/6)

f = 18

f = 18

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