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p in (-oo:+oo)
(1/4)*(p-7) = (1/6)*(p-3) // - (1/6)*(p-3)
(1/4)*(p-7)-((1/6)*(p-3)) = 0
(1/4)*(p-7)+(-1/6)*(p-3) = 0
1/4*(p-7)-1/6*(p-3) = 0
1/4*(p-7)-1/6*(p-3) = 0
1/12*p-5/4 = 0
1/12*p-5/4 = 0
1/12*p-5/4 = 0 // + 5/4
1/12*p = 5/4 // : 1/12
p = 5/4/1/12
p = 15
p = 15
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