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14.6-(x/2.8) = 7.1 // - 7.1
14.6-(x/2.8)-7.1 = 0
14.6-0.35714286*x-7.1 = 0
7.5-0.35714286*x = 0 // - 7.5
-0.35714286*x = -7.5 // : -0.35714286
x = -7.5/(-0.35714286)
x = 20.99999983
x = 20.99999983
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