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b) -5 (-3a-b-1/10) =15a+5b+1/2
c) -5(2a-10b) =-10a+50b
d) 1/2(4a+1)=2a+1/2
b) -5 (-3a-b-1/10) =15a+5b+1/2
c) -5(2a-10b) =-10a+50b
d) 1/2(4a+1)=2a+1/2