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100 = (1/3)*(2*x)^5 // - (1/3)*(2*x)^5
100-((1/3)*(2*x)^5) = 0
(-1/3)*(2*x)^5+100 = 0
-32/3*x^5 = -100 // : -32/3
x^5 = 75/8
x^5 = 75/8 // ^ 1/5
x = (75/8)^(1/5)
x = (75/8)^(1/5)
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