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x in (-oo:+oo)
x-5-2 = -((2*x)/3)-12 // + -((2*x)/3)-12
x+(2*x)/3-5-2+12 = 0
5/3*x+5 = 0 // - 5
5/3*x = -5 // : 5/3
x = -5/5/3
x = -3
x = -3
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