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x in (-oo:+oo)
-4*x-(2/3) = -6 // + 6
6-4*x-(2/3) = 0
6-4*x-2/3 = 0
16/3-4*x = 0 // - 16/3
-4*x = -16/3 // : -4
x = -16/3/(-4)
x = 4/3
x = 4/3
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