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p in (-oo:+oo)
2-((1/7)*p) = -3 // + 3
2-((1/7)*p)+3 = 0
(-1/7)*p+2+3 = 0
5-1/7*p = 0 // - 5
-1/7*p = -5 // : -1/7
p = -5/(-1/7)
p = 35
p = 35
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