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2.5/10 = x/12 // - x/12
2.5/10-(x/12) = 0
0.25-1/12*x = 0 // - 0.25
-1/12*x = -0.25 // : -1/12
x = -0.25/(-1/12)
x = 3.00000012
x = 3.00000012
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