z/-7=-21 - solution

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Solution for z/-7=-21 equation:

z in (-oo:+oo)

z/(-7) = -21 // + 21

z/(-7)+21 = 0

21-1/7*z = 0 // - 21

-1/7*z = -21 // : -1/7

z = -21/(-1/7)

z = 147

z = 147

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