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2.86/5 = x/4 // - x/4
2.86/5-(x/4) = 0
0.572-1/4*x = 0 // - 0.572
-1/4*x = -0.572 // : -1/4
x = -0.572/(-1/4)
x = 2.288
x = 2.288
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