(a+b)-(2a-b)-(a-2b)=a+b-2a+b-a+2b=-2a+4b
(a + b) - (2a - b) - (a - 2b)= a + b - 2a + b - a + 2b = - 2a + 4b
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(a+b)-(2a-b)-(a-2b)=a+b-2a+b-a+2b=-2a+4b
(a + b) - (2a - b) - (a - 2b)= a + b - 2a + b - a + 2b = - 2a + 4b