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b) 2x - 2 - 2x = - 2
c) xkwadrat - x - 3xkwadrat + 3x= - 2xkwadrat - 2x
d) 5a kwadrat - 15a - 3a kwadrat + 15a = 2a kwadrat
e) 3x kwadrat + xy - xy + y= 3x kwadrat + y