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x in (-oo:+oo)
-12 = -(x/3)-4 // + -(x/3)-4
x/3-12+4 = 0
1/3*x-8 = 0 // + 8
1/3*x = 8 // : 1/3
x = 8/1/3
x = 24
x = 24
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