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3.7/2 = x/9 // - x/9
3.7/2-(x/9) = 0
1.85-1/9*x = 0 // - 1.85
-1/9*x = -1.85 // : -1/9
x = -1.85/(-1/9)
x = 16.65000017
x = 16.65000017
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