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a = 1, b= -8, c = 2p-3
X1 = 3X2
X1 + X2 = -b/a
3X2 + X2 = 8
4X2 = 8
X2 = 2
X^2-8x+2p-3 = 0
2^2-8(2)+2p-3 = 0
4-16+2p-3 = 0
2p = 15
p = 7,5