z/3=-7

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Solution for z/3=-7 equation: 


z in (-oo:+oo)

z/3 = -7 // + 7

z/3+7 = 0

1/3*z+7 = 0 // - 7

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

z = -7/1/3

z = -21

z = -21

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