15-z/3=21

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Solution for 15-z/3=21 equation: 


z in (-oo:+oo)

15-(z/3) = 21 // - 21

15-(z/3)-21 = 0

-1/3*z-6 = 0 // + 6

-1/3*z = 6 // : -1/3

z = 6/(-1/3)

z = -18

z = -18

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