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8.9 = x/6.6 // - x/6.6
8.9-(x/6.6) = 0
8.9-0.15151515*x = 0
8.9-0.15151515*x = 0 // - 8.9
-0.15151515*x = -8.9 // : -0.15151515
x = -8.9/(-0.15151515)
x = 58.74000059
x = 58.74000059
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