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b) (-3a-1 1\2):(-3)= a + 0,5
c) (2,4a-1,6b):0,8= 3a - 2
d) (4u-6v):(-1/2)= -8u+12v
1+x-2x=1-x
1/2x-5+6= 1/2x+1
-1,5x+2+0,5x+1=-x+3