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p in (-oo:+oo)
(-7/10)*p = 21/10 // - 21/10
(-7/10)*p-(21/10) = 0
(-7/10)*p-21/10 = 0
-7/10*p-21/10 = 0 // + 21/10
-7/10*p = 21/10 // : -7/10
p = 21/10/(-7/10)
p = -3
p = -3
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