3(21-u)/8=-3u+9

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Solution for 3(21-u)/8=-3u+9 equation: 


u in (-oo:+oo)

(3*(21-u))/8 = 9-3*u // - 9-3*u

(3*(21-u))/8-(-3*u)-9 = 0

(3*(21-u))/8+3*u-9 = 0

(3*(21-u))/8+(3*8*u)/8+(-9*8)/8 = 0

3*(21-u)+3*8*u-9*8 = 0

21*u-72+63 = 0

21*u-9 = 0

(21*u-9)/8 = 0

(21*u-9)/8 = 0 // * 8

21*u-9 = 0

21*u-9 = 0 // + 9

21*u = 9 // : 21

u = 9/21

u = 3/7

u = 3/7

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