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x in (-oo:+oo)
66-((3*x)/1) = 899 // - 899
66-((3*x)/1)-899 = 0
66-3*x-899 = 0
-3*x-833 = 0 // + 833
-3*x = 833 // : -3
x = 833/(-3)
x = -833/3
x = -833/3
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