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