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x+4+2+x+5=°3
2x+11=°3
si x=9
2x+11=°3
2(9)+11=°3
29=°3, no es divisible por 3
si x=8
2x+11=°3
2(8)+11=°3
27=°3, es divisible por 3 nos queda 9
el maximo valor que puede tomar x=8
entonces el valor de x=2