Question

solve the equation given​

Answer 1

Answer:

-3a + 7b - c

Step-by-step explanation:

-2a + 5b - 4c

- (a - 2b - 3c )

- a + 2b + 3c

-------------------------

-3a + 7b - c

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Answer 2

Answer:

Step-by-step explanation:

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

= - 2a + 5b - 4c - a + 2b + 3c (∵ - × + = - ; - × - = + )

= - 3a + 7b - c is the answer.