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(2/5)*(10*x-20)^12 = 0
2/5*(10*x-20)^12 = 0
10*x-20 = 0 // + 20
10*x = 20 // : 10
x = 20/10
x = 2
x in { 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 }
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