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x in (-oo:+oo)
-3*x-(9/10) = x-161/90 // - x-161/90
-3*x-x-(9/10)-(-161/90) = 0
161/90-3*x-x-9/10 = 0
8/9-4*x = 0 // - 8/9
-4*x = -8/9 // : -4
x = -8/9/(-4)
x = 2/9
x = 2/9
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