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39/3=13
es 13
3x = 39
x = 13
por la tanto Matias tiene 13 años.
3.x = 43 -4 3.x = 39 x = 39 : 3 x = 13 3.x +4 =43
3.x = 43 -4
3.x = 39
x = 39 : 3
x = 13