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9.1/9.8 = x/7 // - x/7
9.1/9.8-(x/7) = 0
0.92857143-1/7*x = 0 // - 0.92857143
-1/7*x = -0.92857143 // : -1/7
x = -0.92857143/(-1/7)
x = 6.50000014
x = 6.50000014
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