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1.2/4 = x/9 // - x/9
1.2/4-(x/9) = 0
0.3-1/9*x = 0 // - 0.3
-1/9*x = -0.3 // : -1/9
x = -0.3/(-1/9)
x = 2.70000003
x = 2.70000003
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