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6/7 = x/10.5 // - x/10.5
6/7-(x/10.5) = 0
6/7-0.0952381*x = 0
6/7-0.0952381*x = 0 // - 6/7
-0.0952381*x = -6/7 // : -0.0952381
x = -6/7/(-0.0952381)
x = 8.99999958
x = 8.99999958
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