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2.1/6 = x/4 // - x/4
2.1/6-(x/4) = 0
0.35-1/4*x = 0 // - 0.35
-1/4*x = -0.35 // : -1/4
x = -0.35/(-1/4)
x = 1.4
x = 1.4
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