k/7+6=21

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Solution for k/7+6=21 equation: 


k in (-oo:+oo)

k/7+6 = 21 // - 21

k/7-21+6 = 0

1/7*k-15 = 0 // + 15

1/7*k = 15 // : 1/7

k = 15/1/7

k = 105

k = 105

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