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x in (-oo:+oo)
0.5 = x/68 // - x/68
0.5-(x/68) = 0
0.5-1/68*x = 0 // - 0.5
-1/68*x = -0.5 // : -1/68
x = -0.5/(-1/68)
x = 34.00000544
x = 34.00000544
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