Respuesta :

3 x 9 + 7 = 34
9 + 25 = 34
3X+7=X+25
Subtract x from both sides so that the variable x is only on one side
2x + 7=25
Subtract 7 from 25
2x=18
Divide 2 on both sides so that the only thing on the left side is the variable x.
Final Answer: x=9 * And so the answer is A. 9