p+(1/2p+3)=21 - solution

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Solution for p+(1/2p+3)=21 equation:

p in (-oo:+oo)

p+(1/2)*p+3 = 21 // - 21

p+(1/2)*p-21+3 = 0

3/2*p-18 = 0 // + 18

3/2*p = 18 // : 3/2

p = 18/3/2

p = 12

p = 12

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