u/2-7=21

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Solution for u/2-7=21 equation: 


u in (-oo:+oo)

u/2-7 = 21 // - 21

u/2-21-7 = 0

1/2*u-28 = 0 // + 28

1/2*u = 28 // : 1/2

u = 28/1/2

u = 56

u = 56

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