5(21-u)/8=-5u+15

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Solution for 5(21-u)/8=-5u+15 equation: 


u in (-oo:+oo)

(5*(21-u))/8 = 15-5*u // - 15-5*u

(5*(21-u))/8-(-5*u)-15 = 0

(5*(21-u))/8+5*u-15 = 0

(5*(21-u))/8+(5*8*u)/8+(-15*8)/8 = 0

5*(21-u)+5*8*u-15*8 = 0

35*u-120+105 = 0

35*u-15 = 0

(35*u-15)/8 = 0

(35*u-15)/8 = 0 // * 8

35*u-15 = 0

35*u-15 = 0 // + 15

35*u = 15 // : 35

u = 15/35

u = 3/7

u = 3/7

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