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x in (-oo:+oo)
0.1/6 = x/420 // - x/420
0.1/6-(x/420) = 0
0.01666667-1/420*x = 0 // - 0.01666667
-1/420*x = -0.01666667 // : -1/420
x = -0.01666667/(-1/420)
x = 7.0000084
x = 7.0000084
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