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4^3*x-5 = 1/8 // - 1/8
4^3*x-(1/8)-5 = 0
4^3*x-1/8-5 = 0
64*x-41/8 = 0 // + 41/8
64*x = 41/8 // : 64
x = 41/8/64
x = 41/512
x = 41/512
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