from the first one, you can see that x is odd.

now you do the second one.

this means 2x leaves a remainder of 3 when divided by 9.

this means x is a multiple of 3.

now, 3x divided by 25 leaves remainder of 1 from the third one.

now you do guess and check and see tht the first x is 17, the next is 42, the next is 67, and on and on

this means that the number when divided by 25 leaves remainder 17, and that it is odd.

2x is remainder of 3 when divided by 9, so the first one would be 42, then adding 225 (with some intuition), so then it would be 942 would be one, then 1167. you can double check and it all works.

HOPE THIS HELPED!