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p in (-oo:+oo)
4*p-(30/3) = 6 // - 6
4*p-(30/3)-6 = 0
4*p-10-6 = 0
4*p-16 = 0 // + 16
4*p = 16 // : 4
p = 16/4
p = 4
p = 4
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