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x in (-oo:+oo)
(2*p-q)/4 = 8*p // - 8*p
(2*p-q)/4-(8*p) = 0
(2*p-q)/4-8*p = 0
(2*p-q)/4+(-8*4*p)/4 = 0
2*p-8*4*p-q = 0
-30*p-q = 0
(-30*p-q)/4 = 0
(-30*p-q)/4 = 0 // * 4
-30*p-q = 0
x belongs to the empty set
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