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x in (-oo:+oo)
(-2/3)*x = 12/3 // - 12/3
(-2/3)*x-(12/3) = 0
(-2/3)*x-4 = 0
-2/3*x-4 = 0 // + 4
-2/3*x = 4 // : -2/3
x = 4/(-2/3)
x = -6
x = -6
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