A/-2=-21 - solution

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Solution for A/-2=-21 equation:

A in (-oo:+oo)

A/(-2) = -21 // + 21

A/(-2)+21 = 0

21-1/2*A = 0 // - 21

-1/2*A = -21 // : -1/2

A = -21/(-1/2)

A = 42

A = 42

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