Answer:
C
Explanation:
how do you know if an equation has infinite solutions?
if the equation ends with a true statement, like 3=3, then you know it has sinfinite solutions. in this situation x=x
C:
3(2x+1)=6x+3
(multiply 3 by (2x+1))
6x+3=6x+3
(subtract 6x-3 from both sides)
0=0