20=u/3+13

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Solution for 20=u/3+13 equation: 


u in (-oo:+oo)

20 = u/3+13 // - u/3+13

20-(u/3)-13 = 0

7-1/3*u = 0 // - 7

-1/3*u = -7 // : -1/3

u = -7/(-1/3)

u = 21

u = 21

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