12 anos
12 +12=24 -8=12
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x+12=3(x-8)
X+12=3X-24
X-3X=-12-24
-2X = -36
X=
X=+18 <----------RAZÓN POR LA CUAL - x - =+
Esa es tu respuesta.
12 anos
12 +12=24 -8=12