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x in (-oo:+oo)
(-3/12)*x = 2/3 // - 2/3
(-3/12)*x-(2/3) = 0
(-3/12)*x-2/3 = 0
-1/4*x-2/3 = 0 // + 2/3
-1/4*x = 2/3 // : -1/4
x = 2/3/(-1/4)
x = -8/3
x = -8/3
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