It isn't always. In fact, it almost never is.
The only time it is is when 'b' is 22/3 .
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It is not correct that 2b plus b equals 8. If we have 2b + b, it equals 3b, not 8. The value of b would need to be 8/3 in order for the equation to be true.
b + a + b - a = 2b
2s-2b= a+b+c-2b simplified that would be a+c-b.
2B Multiplied by 3 plus B = 7B. Here is how it's worked out. You start with 2B, multiply that by 3 and you get 6B. Now all you have to do is add the last B, therefore adding 1B to equal 7B.
What is the answers to -7 ( a + b - 5 ) + 8 ( -3a +2b ) + b ( 7 + 3 )
a+a+a+a+b+b - add the like terms =4a+2b 4a and 2b cannot be added because they are not like terms.