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6.3/9.8 = x/7 // - x/7
6.3/9.8-(x/7) = 0
0.64285714-1/7*x = 0 // - 0.64285714
-1/7*x = -0.64285714 // : -1/7
x = -0.64285714/(-1/7)
x = 4.50000007
x = 4.50000007
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