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7p-p-p=22-7
7p-2p=15
5p=15
P=15/5
P=3
7p + 7 - p - p - 22 = 0
7p - p - p = 22 - 7
5p = 15
15
p = ------ = 3 ⇒ p = 3
5
Comprobación.
7p + (7 - p) -(p + 22) = 0
7(3) + 7 - 3 - 3 - 22 = 0
21 + 7 - 6 - 22 = 0
0 = 0