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x in (-oo:+oo)
0.4 = x/528 // - x/528
0.4-(x/528) = 0
0.4-1/528*x = 0 // - 0.4
-1/528*x = -0.4 // : -1/528
x = -0.4/(-1/528)
x = 211.19993242
x = 211.19993242
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