Respuesta :
Answer: 9
Step-by-step explanation:
Move all numbers that don't contain x to the right side and solve.
3x=21+6
3x=27
27/3=X
27/3=9
9=X
Answer: 9
Step-by-step explanation:
Move all numbers that don't contain x to the right side and solve.
3x=21+6
3x=27
27/3=X
27/3=9
9=X