2p/3+21=9 - solution

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Solution for 2p/3+21=9 equation:

p in (-oo:+oo)

(2*p)/3+21 = 9 // - 9

(2*p)/3-9+21 = 0

2/3*p+12 = 0 // - 12

2/3*p = -12 // : 2/3

p = -12/2/3

p = -18

p = -18

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