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x in (-oo:+oo)
0.839 = x/8 // - x/8
0.839-(x/8) = 0
0.839-1/8*x = 0 // - 0.839
-1/8*x = -0.839 // : -1/8
x = -0.839/(-1/8)
x = 6.712
x = 6.712
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