Раскройте скобки и приведите подобные слагаемые 1,8x-4(0,5x-0,1)=
8(0,5x-3)-2(5-2x)=
6(2-1,5x)+3(3x-2)=
1 2/3x-4(1/24x+1)=
-(a+2,1b)+(3,8a-1,9b)=
-(0,85a-0,7b+2,1a)+(a-0,65b)
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