1, 15x+9=20x-11
2, 6p+3/9=2p-4/2

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Solution

1. 15x+9=20x-11
9+11=20x-15x
20=5x
x=20/5
x=4
2. 6p+3/9=2p-4/2
6p-2p=4/2 - 3/9
4p=-2- 1/3
4p=(-6-1)/3
4p=-7/3
p=-7/(3*4)
p=-7/12

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