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(2/3)*x-5/7 = -27/28 // + -27/28
(2/3)*x-5/7-(-27/28) = 0
(2/3)*x-5/7+27/28 = 0
2/3*x+1/4 = 0 // - 1/4
2/3*x = -1/4 // : 2/3
x = -1/4/2/3
x = -3/8
x = -3/8
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