21+r/7=24

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Solution for 21+r/7=24 equation: 


r in (-oo:+oo)

r/7+21 = 24 // - 24

r/7-24+21 = 0

1/7*r-3 = 0 // + 3

1/7*r = 3 // : 1/7

r = 3/1/7

r = 21

r = 21

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