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a) 2x+3y+7-8y7+x-6y=3x+7-8y7-3y
b)5x-6+x-15-2x+3xy=4x-21+3xy
c)3m+4n+7m-3m+8-6=4n+7m+2
d)2x-8y-3y+8+8y+5x-7=7x-3y+1
b)4x-21+3xy
c)7m+4n+2
d)7x+3y+1
dawno to miałem i nie wiem czy dobrze xD