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3x-y
2)
a+1/2
3)0,3a-0,2b
4)-2u+3v
2. (-3a-1i jedna druga):(-3)=-a- jedna druga
3. (2,4a-1,6b):0,8/razy 10
(24a-16b):8= 3a-2b
4. (4u-6v):(- jedna druga)= -2u+6v