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p in (-oo:+oo)
4*p+2 = 9/5 // - 9/5
4*p-(9/5)+2 = 0
4*p-9/5+2 = 0
4*p+1/5 = 0 // - 1/5
4*p = -1/5 // : 4
p = -1/5/4
p = -1/20
p = -1/20
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