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p in (-oo:+oo)
((2^1)/7)*p = -3 // + 3
((2^1)/7)*p+3 = 0
(2/7)*p+3 = 0
2/7*p+3 = 0 // - 3
2/7*p = -3 // : 2/7
p = -3/2/7
p = -21/2
p = -21/2
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