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(1/21)*x-(6/7) = 2/3 // - 2/3
(1/21)*x-(6/7)-(2/3) = 0
(1/21)*x-6/7-2/3 = 0
1/21*x-32/21 = 0 // + 32/21
1/21*x = 32/21 // : 1/21
x = 32/21/1/21
x = 32
x = 32
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