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6*x-((2*x)/21) = 25/21 // - 25/21
6*x-((2*x)/21)-(25/21) = 0
6*x+(-2/21)*x-25/21 = 0
124/21*x-25/21 = 0 // + 25/21
124/21*x = 25/21 // : 124/21
x = 25/21/124/21
x = 25/124
x = 25/124
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