а) 5(2а+1)-3=10а+5-3= 10а+2
б)14х-(х-1)+(2х+6)=14х-х+1+2х+6=15х+7
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а) 5(2а+1)-3=10а+5-3= 10а+2
б)14х-(х-1)+(2х+6)=14х-х+1+2х+6=15х+7