Rearrange the like terms first.
1. 4x+3x+9=30
add the like terms
2. 7x+9=30
move the 9 to the other side.
3. 7x=30-9
subtract them
4. 7x=21
divide bothers sides by 7
5.
which it will end with the result of
x=3
1. 4x+3x+9=30
add the like terms
2. 7x+9=30
move the 9 to the other side.
3. 7x=30-9
subtract them
4. 7x=21
divide bothers sides by 7
5.
which it will end with the result of
x=3