1) -a+b+2a-3b = -a+2a+b-3b = a-2b
2) 4x-3y-x+y = 4x-x-3y+y = 3x-2y
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1) а-2b
2) 3x-2y
1) -a+b+2a-3b = -a+2a+b-3b = a-2b
2) 4x-3y-x+y = 4x-x-3y+y = 3x-2y