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6=4p
6/4=p
3/2=p
1,5=p
21 + 2p = 3(2p) + 3(5)
21 + 2p = 6p + 15
2p - 6p = 15 - 21
- 4p = - 6
p = -6/-4
p = 6/4
p = 3/2