3u/5=21

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Solution for 3u/5=21 equation: 


u in (-oo:+oo)

(3*u)/5 = 21 // - 21

(3*u)/5-21 = 0

3/5*u-21 = 0 // + 21

3/5*u = 21 // : 3/5

u = 21/3/5

u = 35

u = 35

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