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1. 1/5у-(3у-4/5)+4=
2. -3(2,4-0,1х)+2,7х=
3. (-21)(х+у)-3(х-у)=
4. (-0,3х+2)-(5-0,2х)=
1. 1/5у-(3у-4/5)+4=
2. -3(2,4-0,1х)+2,7х=
3. (-21)(х+у)-3(х-у)=
4. (-0,3х+2)-(5-0,2х)=
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2. -3(2,4-0,1х)+2,7х= -7,2+0,3x+2,7x= -7,2+3x
3. (-21)(х+у)-3(х-у)= -21x-21y-3x+3y= -24x-18y
4. (-0,3х+2)-(5-0,2х)= -0,3x+2-5+0,2x= -0,1x-3