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p in (-oo:+oo)
2*p-4 = (3*p)/2 // - (3*p)/2
2*p-((3*p)/2)-4 = 0
2*p+(-3/2)*p-4 = 0
1/2*p-4 = 0 // + 4
1/2*p = 4 // : 1/2
p = 4/1/2
p = 8
p = 8
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