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100/4-(x/2.83) = 0
100/4-0.35335689*x = 0
25-0.35335689*x = 0 // - 25
-0.35335689*x = -25 // : -0.35335689
x = -25/(-0.35335689)
x = 70.75000009
x = 70.75000009
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