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(2*x-3)/5 = 6/7 // - 6/7
(2*x-3)/5-(6/7) = 0
(2*x-3)/5-6/7 = 0
(7*(2*x-3))/(5*7)+(-6*5)/(5*7) = 0
7*(2*x-3)-6*5 = 0
14*x-51 = 0
(14*x-51)/(5*7) = 0
(14*x-51)/(5*7) = 0 // * 5*7
14*x-51 = 0
14*x-51 = 0 // + 51
14*x = 51 // : 14
x = 51/14
x = 51/14
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