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(-p)^4 = x/20-5 // - x/20-5
(-p)^4-(x/20)+5 = 0
p^4-1/20*x+5 = 0 // - p^4+5
-1/20*x = -(p^4+5) // : -1/20
x = (-(p^4+5))/(-1/20)
x = 20*(p^4+5)
x = 20*(p^4+5)
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