Question

add 7a - 3 b + 5C;2a-3b-4c and c-4a+b

Answer 1

7a-3b+5c
+2a-3b-4c
+-4a+b+c

the answer is
5a-5b+2c

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Answer 2

Such questions can be solved quite easily by simply adding the numerical values of  those terms whose variables are similar.

( 7a - 3b + 5c ) + ( 2a - 3b - 4c ) + ( c - 4a + b )

On simplifying further,

5a - 5b + 2c