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p in (-oo:+oo)
4*p-224 = (8*p)/9 // - (8*p)/9
4*p-((8*p)/9)-224 = 0
4*p+(-8/9)*p-224 = 0
28/9*p-224 = 0 // + 224
28/9*p = 224 // : 28/9
p = 224/28/9
p = 72
p = 72
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