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x in (-oo:+oo)
(1/6)*x+17 = 3*x-21 // - 3*x-21
(1/6)*x-(3*x)+17+21 = 0
(1/6)*x-3*x+17+21 = 0
38-17/6*x = 0 // - 38
-17/6*x = -38 // : -17/6
x = -38/(-17/6)
x = 228/17
x = 228/17
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