-1,6(x+y)+3(2x+y)=-1,6x-1,6y+6x+3y=4,4x+1,4y
1,7(m-n)-0,32(-m+n)=1,7m-1,7n+0,32m-0,32n=2,02m-2,02n
4(7-5x)-(12-20x)=28-20x-12+20x=16
2(3x-y)-(5x-2y)=6x-2y-5x+2y=x
6(x+2y)-3(2x+y)=6x+12y-6x-3y=9y
0,98c-7-0,48c=0,5c-7
16,7x+0,5(-1,4x)=16,7x-0,7x=16x
2,3(b-8)-(b-3,4)=2,3b-18,4-b+3,4=1,3b-15