Respuesta :

Answer:

  3x=27

Step-by-step explanation:

3(3x+4)=12x-15

9x+12=12x-15

-9x      -9x

___________

12=3x-15

+15    +15

_________

27=3x

3x=27

Answer:

9

Step-by-step explanation:

3(3x+4)=12x-15

or,3x+4=3(4x-5)/3

or,3x+4=4x-5

or,4+5=4x-3x

or,9=x

.:x=9

Hence,

x=9

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