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6.8571 = (6/7)*x+6 // - (6/7)*x+6
6.8571-((6/7)*x)-6 = 0
(-6/7)*x-6+6.8571 = 0
0.8571-6/7*x = 0 // - 0.8571
-6/7*x = -0.8571 // : -6/7
x = -0.8571/(-6/7)
x = 0.99995
x = 0.99995
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