7-12=z/-4 - solution

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Solution for 7-12=z/-4 equation:

z in (-oo:+oo)

7-12 = z/(-4) // - z/(-4)

7-(z/(-4))-12 = 0

1/4*z-5 = 0 // + 5

1/4*z = 5 // : 1/4

z = 5/1/4

z = 20

z = 20

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