Review of the second volume of seventh grade mathematics 8 11page solution1big questions 2 big questions 3 big questions 4 big questions 6 big questions See Note: The process is detailed.
Solution: 2b+3=3b+20 Solution: 6y-x=7①.
2b-3b=-3+20 x-y= 13②
-b= 17 ①+② 5y=20
b= 17 y=4