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(1/3)*((2/5)*x-(6/7)) = 0
(1/3)*((2/5)*x-6/7) = 0
1/3*(2/5*x-6/7) = 0
2/5*x-6/7 = 0 // + 6/7
2/5*x = 6/7 // : 2/5
x = 6/7/2/5
x = 15/7
x = 15/7
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