Question

x+(x+31)=73

2(x+4)-6=3(x-2)+7x

3(y+1)+6y=-2(y-1)+8

2(x-2)-1=5

-(4+x)=2(3-x)

Answer 1

2x+31=73

2x=73-31

2x=42 (podziel przez 2)

x=21

 

2x+8-6=3x-6+7

-x+1=0

-x=-1

x=1

 

3y+3+6y=-2y+2 +8

9y=7

y=7/9

 

2x-2-1=5

2x=8

x=4

 

-4-4x=6-2x

-2x=10

x=-5

 

Answer 2

x+(x+31)=73

x+x+31=73

2x=73-31

2x=42  //2

x=21

 

2(x+4)-6=3(x-2)+7x

2x+8-6=3x-6+7x

2x-10x=-8

-8x=-8 //-8

x=1

 

3(y+1)+6y=-2(y-1)+8

3y+3+6y=-2y+2+8

11y=7 //11

y=7/11

 

2(x-2)-1=5

2x-4-1=5

2x=10 //2

x=5

 

-(4+x)=2(3-x)

-4-x=6-2x

x=10