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p in (-oo:+oo)
3*p-(7/2) = 7 // - 7
3*p-(7/2)-7 = 0
3*p-7/2-7 = 0
3*p-21/2 = 0 // + 21/2
3*p = 21/2 // : 3
p = 21/2/3
p = 7/2
p = 7/2
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