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p in (-oo:+oo)
(-1/4)*(p-12) = -7 // + 7
(-1/4)*(p-12)+7 = 0
7-1/4*(p-12) = 0
7-1/4*(p-12) = 0
10-1/4*p = 0
10-1/4*p = 0
10-1/4*p = 0 // - 10
-1/4*p = -10 // : -1/4
p = -10/(-1/4)
p = 40
p = 40
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