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3*5*x = 1/125 // - 1/125
3*5*x-(1/125) = 0
3*5*x-1/125 = 0
15*x-1/125 = 0 // + 1/125
15*x = 1/125 // : 15
x = 1/125/15
x = 1/1875
x = 1/1875
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