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45.2/30 = x/12 // - x/12
45.2/30-(x/12) = 0
1.50666667-1/12*x = 0 // - 1.50666667
-1/12*x = -1.50666667 // : -1/12
x = -1.50666667/(-1/12)
x = 18.08000076
x = 18.08000076
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