8-15=z/-3 - solution

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Solution for 8-15=z/-3 equation:

z in (-oo:+oo)

8-15 = z/(-3) // - z/(-3)

8-(z/(-3))-15 = 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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