a/-7=-3

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Solution for a/-7=-3 equation: 


a in (-oo:+oo)

a/(-7) = -3 // + 3

a/(-7)+3 = 0

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

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

a = -3/(-1/7)

a = 21

a = 21

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