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x in (-oo:+oo)
s = (1/5)*(300-(10*x^5)) // - (1/5)*(300-(10*x^5))
s-((1/5)*(300-(10*x^5))) = 0
(-1/5)*(300-10*x^5)+s = 0
s-1/5*(300-10*x^5) = 0
s-1/5*(300-10*x^5) = 0
s+2*x^5-60 = 0
s+2*x^5-60 = 0
2*x^5 = -(s-60) // : 2
x^5 = (60-s)/2
x^5 = (60-s)/2 // ^ 1/5
x = ((60-s)^(1/5))/(2^(1/5))
x = ((60-s)^(1/5))/(2^(1/5))
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