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4/6 = x/3.5 // - x/3.5
4/6-(x/3.5) = 0
4/6-0.28571429*x = 0
2/3-0.28571429*x = 0 // - 2/3
-0.28571429*x = -2/3 // : -0.28571429
x = -2/3/(-0.28571429)
x = 2.33333331
x = 2.33333331
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