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6/7-4*x = -274/7 // + -274/7
6/7-4*x-(-274/7) = 0
6/7-4*x+274/7 = 0
40-4*x = 0 // - 40
-4*x = -40 // : -4
x = -40/(-4)
x = 10
x = 10
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