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x in (-oo:+oo)
(2/3)*x+6 = 1/2 // - 1/2
(2/3)*x-(1/2)+6 = 0
(2/3)*x-1/2+6 = 0
2/3*x+11/2 = 0 // - 11/2
2/3*x = -11/2 // : 2/3
x = -11/2/2/3
x = -33/4
x = -33/4
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