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x in (-oo:+oo)
(1/6)*(-12*x-7) = 0
1/6*(-12*x-7) = 0
( -12*x-7 )
-12*x-7 = 0 // + 7
-12*x = 7 // : -12
x = 7/(-12)
x = -7/12
( 1/6 )
1/6 = 0
x belongs to the empty set
x = -7/12
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