2p+20% of (2p-1)=7

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Solution

2p + 20% of (2p - 1) = 7
2p + 20/100(2p - 1) = 7
2p + 1/5(2p - 1) = 7
2p + 2/5p - 1/5 = 7
(10p + 2p - 1)/5 = 7
(12p - 1)/5 = 7
12p - 1 = 7 * 5
12p - 1 = 35
12p = 35 + 1
12p = 36
P = 36/12
P = 3

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