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x in (-oo:+oo)
x+4 = x/3-6-4 // - x/3-6-4
x-(x/3)+4+4+6 = 0
2/3*x+14 = 0 // - 14
2/3*x = -14 // : 2/3
x = -14/2/3
x = -21
x = -21
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