1/9=-z/7

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Solution for 1/9=-z/7 equation: 


z in (-oo:+oo)

1/9 = -z/7 // + -z/7

1/9-(-z/7) = 0

(1/7)*z+1/9 = 0

1/7*z+1/9 = 0 // - 1/9

1/7*z = -1/9 // : 1/7

z = -1/9/1/7

z = -7/9

z = -7/9

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