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3*x-((1/4)*x)-9 = 5/7 // - 5/7
3*x-((1/4)*x)-(5/7)-9 = 0
3*x+(-1/4)*x-5/7-9 = 0
11/4*x-68/7 = 0 // + 68/7
11/4*x = 68/7 // : 11/4
x = 68/7/11/4
x = 272/77
x = 272/77
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