2*(10.5+-0.5y)+y=21

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Solution for 2*(10.5+-0.5y)+y=21 equation: 



2(10.5+-0.5y)+y=21

We move all terms to the left:

2(10.5+-0.5y)+y-(21)=0

We add all the numbers together, and all the variables

2(-0.5y)+y-21=0

We add all the numbers together, and all the variables

y+2(-0.5y)-21=0

We multiply parentheses

y+0y-21=0

We add all the numbers together, and all the variables

2y-21=0

We move all terms containing y to the left, all other terms to the right

2y=21

y=21/2

y=10+1/2

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