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x in (-oo:+oo)
(1/3)*x+1/2 = x+7/12 // - x+7/12
(1/3)*x-x+1/2-(7/12) = 0
(1/3)*x-x+1/2-7/12 = 0
-2/3*x-1/12 = 0 // + 1/12
-2/3*x = 1/12 // : -2/3
x = 1/12/(-2/3)
x = -1/8
x = -1/8
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