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x in (-oo:+oo)
x+12 = x/10+3/10 // - x/10+3/10
x-(x/10)-(3/10)+12 = 0
x-(x/10)-3/10+12 = 0
9/10*x+117/10 = 0 // - 117/10
9/10*x = -117/10 // : 9/10
x = -117/10/9/10
x = -13
x = -13
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