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p in (-oo:+oo)
91/8 = (-21/4)*p // - (-21/4)*p
91/8-((-21/4)*p) = 0
(21/4)*p+91/8 = 0
21/4*p+91/8 = 0 // - 91/8
21/4*p = -91/8 // : 21/4
p = -91/8/21/4
p = -13/6
p = -13/6
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