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4.86/7 = x/4 // - x/4
4.86/7-(x/4) = 0
0.69428571-1/4*x = 0 // - 0.69428571
-1/4*x = -0.69428571 // : -1/4
x = -0.69428571/(-1/4)
x = 2.77714284
x = 2.77714284
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