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3.6/2.9 = x/4.3 // - x/4.3
3.6/2.9-(x/4.3) = 0
3.6/2.9-0.23255814*x = 0
1.24137931-0.23255814*x = 0 // - 1.24137931
-0.23255814*x = -1.24137931 // : -0.23255814
x = -1.24137931/(-0.23255814)
x = 5.33793102
x = 5.33793102
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