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p in (-oo:+oo)
(1/4)*(p-30) = 30 // - 30
(1/4)*(p-30)-30 = 0
1/4*(p-30)-30 = 0
1/4*(p-30)-30 = 0
1/4*p-75/2 = 0
1/4*p-75/2 = 0
1/4*p-75/2 = 0 // + 75/2
1/4*p = 75/2 // : 1/4
p = 75/2/1/4
p = 150
p = 150
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