1. (m-2n+5k)*5
2. -4(-7x+5)=-160
28x-20=-160
28x=140|:28
x=5
3. -m>m верно при m<0
4. 3(5x-6)-3(5x+4y)+8y-10=15x-18-15x-12y+8y-10=-4y-28
1. (m-2n+5k)*5
2. -4(-7x+5)=-160
28x-20=-160
28x=140|:28
x=5
3. -m>m верно при m<0
4. 3(5x-6)-3(5x+4y)+8y-10=15x-18-15x-12y+8y-10=-4y-28