pa answer i brainlest ko kayo don't answer nonsense i will report

Answer:
6. 5(a+b), variables a and b
7. 12-2x, variable x
8. 51-5r, variable r
9. 7(2-x), variable x
10. [tex]\frac{12}{4} + x = 3+x[/tex], variable x
Step-by-step explanation: