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(2/3)*x-(1/2) = -2/7 // + -2/7
(2/3)*x-(1/2)-(-2/7) = 0
(2/3)*x-1/2+2/7 = 0
2/3*x-3/14 = 0 // + 3/14
2/3*x = 3/14 // : 2/3
x = 3/14/2/3
x = 9/28
x = 9/28
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