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((2*x)^5)/3 = 243 // - 243
((2*x)^5)/3-243 = 0
32/3*x^5 = 243 // : 32/3
x^5 = 729/32
x^5 = 729/32 // ^ 1/5
x = (729/32)^(1/5)
x = (729/32)^(1/5)
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