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6.9 = x/(4870/40) // - x/(4870/40)
6.9-(x/(4870/40)) = 0
(-4/487)*x+6.9 = 0
6.9-4/487*x = 0 // - 6.9
-4/487*x = -6.9 // : -4/487
x = -6.9/(-4/487)
x = 840.07524152
x = 840.07524152
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