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