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150/360 = x/31.4 // - x/31.4
150/360-(x/31.4) = 0
150/360-0.03184713*x = 0
5/12-0.03184713*x = 0 // - 5/12
-0.03184713*x = -5/12 // : -0.03184713
x = -5/12/(-0.03184713)
x = 13.08333498
x = 13.08333498
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