Question

Add (a+2b)+(-2a-b)+(-a+2b)+(a-2b)

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Answer 1

(a+2b) + (-2a-b) + (-a+2b) + (a-2b)

= a + 2b -2a - b -a + 2b + a - 2b
= a + a - 2a - a + 2b + 2b - 2b - b
= a + b

This is your answer hope it helps you
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Answer 2

Answer:

=3a+2a−a−2b+5b−b+5c−7c+c

weget,

=4a+2b−c

hope this helps you