4+p/-2=21 - solution

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Solution for 4+p/-2=21 equation:

p in (-oo:+oo)

p/(-2)+4 = 21 // - 21

p/(-2)-21+4 = 0

-1/2*p-17 = 0 // + 17

-1/2*p = 17 // : -1/2

p = 17/(-1/2)

p = -34

p = -34

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