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4-(2a+1)= 4 -2a - 1 = 3 -2a
2b-(4b-2)= 2b -4b + 2 = -2b +2
4-(2a+1)=4-2a-1=-2a+3
2b-(4b-2)=2b-4b+2=-2b+2
4-(2a+1)= 4 - 2a - 1 = 3 - 2a
2b-(4b-2)= 2b - 4b + 2 = -2b +2