a/21=-3

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Solution for a/21=-3 equation: 


a in (-oo:+oo)

a/21 = -3 // + 3

a/21+3 = 0

1/21*a+3 = 0 // - 3

1/21*a = -3 // : 1/21

a = -3/1/21

a = -63

a = -63

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