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p in (-oo:+oo)
-7 = (1/7)*p // - (1/7)*p
-((1/7)*p)-7 = 0
(-1/7)*p-7 = 0
-1/7*p-7 = 0 // + 7
-1/7*p = 7 // : -1/7
p = 7/(-1/7)
p = -49
p = -49
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