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(5/21)*x = 2/3-(1/7) // - 2/3-(1/7)
(5/21)*x-(2/3)+1/7 = 0
(5/21)*x-2/3+1/7 = 0
5/21*x-11/21 = 0 // + 11/21
5/21*x = 11/21 // : 5/21
x = 11/21/5/21
x = 11/5
x = 11/5
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