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6.9 = x/(6000/40) // - x/(6000/40)
6.9-(x/(6000/40)) = 0
(-1/150)*x+6.9 = 0
6.9-1/150*x = 0 // - 6.9
-1/150*x = -6.9 // : -1/150
x = -6.9/(-1/150)
x = 1034.9994825
x = 1034.9994825
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