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5.71/7 = x/4 // - x/4
5.71/7-(x/4) = 0
0.81571429-1/4*x = 0 // - 0.81571429
-1/4*x = -0.81571429 // : -1/4
x = -0.81571429/(-1/4)
x = 3.26285716
x = 3.26285716
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