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(2/3)*x-(1/2) = -6/7 // + -6/7
(2/3)*x-(1/2)-(-6/7) = 0
(2/3)*x-1/2+6/7 = 0
2/3*x+5/14 = 0 // - 5/14
2/3*x = -5/14 // : 2/3
x = -5/14/2/3
x = -15/28
x = -15/28
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