5ab-2ab+4a-b+5b = 3ab+4a+4b
a-b+a-b+2b+a = 4a
4a + 3c - 2b - c + a - b = 5a - 3b + 2c
The expression is: (4a+b)/(2a-5b)
6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b
5ab-2ab+4a-b+5b = 3ab+4a+4b
a+a+a+a+b+b - add the like terms =4a+2b 4a and 2b cannot be added because they are not like terms.
a-b+a-b+2b+a = 4a
It is an expression of two terms as: 4a+12
4a+3-a =12 4a-a = 12-3 3a = 9 a = 3
4a + 3c - 2b - c + a - b = 5a - 3b + 2c
7a-2b
The expression is: (4a+b)/(2a-5b)
(a + 2 - b) (a + 2 + b)
1/4
It is 2a-b simplified
It depends on the exact form. If it is 4a + 12/(a + 3) then a cannot be -3 However, (4a + 12)/(a + 3) simplifies to 4. So there is no variable to worry about!