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80/89 = x/10.407 // - x/10.407
80/89-(x/10.407) = 0
80/89-0.09608917*x = 0
80/89-0.09608917*x = 0 // - 80/89
-0.09608917*x = -80/89 // : -0.09608917
x = -80/89/(-0.09608917)
x = 9.35460677
x = 9.35460677
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