а) (2y+z)-(z-2y) 
б) (x+3)-(5x-7)
в) ( 2a-1) +(3 - 4a)
г) (a+b ) - ( a - b ) - ( b - a ) 
д ) (3m - 1 ) - (2y -2 ) + ( y -3 ) 
Спасибо если решите до вечера . 
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