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x in (-oo:+oo)
(1/6)*(4*x-42) = 3*x // - 3*x
(1/6)*(4*x-42)-(3*x) = 0
(1/6)*(4*x-42)-3*x = 0
1/6*(4*x-42)-3*x = 0
1/6*(4*x-42)-3*x = 0
-7/3*x-7 = 0
-7/3*x-7 = 0
-7/3*x-7 = 0 // + 7
-7/3*x = 7 // : -7/3
x = 7/(-7/3)
x = -3
x = -3
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