5A=5-b
5A=3-b
since both right-hand sides are equal to 5A, they are equal to each other, so
5-b = 3-b
5 = 3, which was false when I went to school, so
no solution to your problem.
5A=3-b
5-b = 3-b
5 = 3, which was false when I went to school, so
no solution to your problem.