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(2/5)*x-(3/2) = -8/7 // + -8/7
(2/5)*x-(3/2)-(-8/7) = 0
(2/5)*x-3/2+8/7 = 0
2/5*x-5/14 = 0 // + 5/14
2/5*x = 5/14 // : 2/5
x = 5/14/2/5
x = 25/28
x = 25/28
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