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3x=39
x=39/3
x=13
2 veces ese numero= 2x= 2(13)=26
Salu2
3(x - 7)=32 --> x-7 = 32/3 --> x-7 = 10.66 --> x= 17.66 --> 2x = 35.33
Si es:
3x -7 = 32 --> 3x = 32 + 7 --> 3x= 39 --> x= 13 --> 2x= 26