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-4*x = -6/7 // + -6/7
-4*x-(-6/7) = 0
6/7-4*x = 0
6/7-4*x = 0 // - 6/7
-4*x = -6/7 // : -4
x = -6/7/(-4)
x = 3/14
x = 3/14
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