For example, a math problem, I can't figure out why, the answer is 23. Thank you. . I just want to know how 23 came from.
The solution is known and available.
Answer? -a？ -3a=0
Answer? -a-3=0
b？ -b-3=0
Original formula =2(a? -a？ -3a)+5(a？ -a-3)+(b？ -b-3)+ 15+3+5
=0+0+0+23
=23