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7.8/7.2 = x/6 // - x/6
7.8/7.2-(x/6) = 0
1.08333333-1/6*x = 0 // - 1.08333333
-1/6*x = -1.08333333 // : -1/6
x = -1.08333333/(-1/6)
x = 6.49999985
x = 6.49999985
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