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3*x-((2/5)*x) = 6/11 // - 6/11
3*x-((2/5)*x)-(6/11) = 0
3*x+(-2/5)*x-6/11 = 0
13/5*x-6/11 = 0 // + 6/11
13/5*x = 6/11 // : 13/5
x = 6/11/13/5
x = 30/143
x = 30/143
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