z/3=-21

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Solution for z/3=-21 equation: 


z in (-oo:+oo)

z/3 = -21 // + 21

z/3+21 = 0

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

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

z = -21/1/3

z = -63

z = -63

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