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x in (-oo:+oo)
0 = (-2/3)*x-12 // - (-2/3)*x-12
0-((-2/3)*x)+12 = 0
(2/3)*x+0+12 = 0
2/3*x+12 = 0 // - 12
2/3*x = -12 // : 2/3
x = -12/2/3
x = -18
x = -18
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