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p in (-oo:+oo)
(6/7)*p-12 = -3 // + 3
(6/7)*p-12+3 = 0
6/7*p-9 = 0 // + 9
6/7*p = 9 // : 6/7
p = 9/6/7
p = 21/2
p = 21/2
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