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x in (-oo:+oo)
0.85 = x/3 // - x/3
0.85-(x/3) = 0
0.85-1/3*x = 0 // - 0.85
-1/3*x = -0.85 // : -1/3
x = -0.85/(-1/3)
x = 2.55000003
x = 2.55000003
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