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p in (-oo:+oo)
(1/4)*(2*p+7) = 1 // - 1
(1/4)*(2*p+7)-1 = 0
1/4*(2*p+7)-1 = 0
1/4*(2*p+7)-1 = 0
1/2*p+3/4 = 0
1/2*p+3/4 = 0
1/2*p+3/4 = 0 // - 3/4
1/2*p = -3/4 // : 1/2
p = -3/4/1/2
p = -3/2
p = -3/2
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