12 anos 40-28=12 12÷2=6 6+6=12
2x+28=40 2x=40-28 2x=12 x=12/2 x=6 x=6+6*=12 *dentro de 6 años
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12 anos 40-28=12 12÷2=6 6+6=12
2x+28=40 2x=40-28 2x=12 x=12/2 x=6 x=6+6*=12 *dentro de 6 años