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6/7-5*x+4/7 = (-2*x)/5 // - (-2*x)/5
6/7-5*x-((-2*x)/5)+4/7 = 0
(2/5)*x-5*x+6/7+4/7 = 0
10/7-23/5*x = 0 // - 10/7
-23/5*x = -10/7 // : -23/5
x = -10/7/(-23/5)
x = 50/161
x = 50/161
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