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p in (-oo:+oo)
(-1/2)*(12*p-42) = -33 // + 33
(-1/2)*(12*p-42)+33 = 0
33-1/2*(12*p-42) = 0
33-1/2*(12*p-42) = 0
54-6*p = 0
54-6*p = 0
54-6*p = 0 // - 54
-6*p = -54 // : -6
p = -54/(-6)
p = 9
p = 9
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