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x in (-oo:+oo)
0.839 = x/20 // - x/20
0.839-(x/20) = 0
0.839-1/20*x = 0 // - 0.839
-1/20*x = -0.839 // : -1/20
x = -0.839/(-1/20)
x = 16.78
x = 16.78
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