3(7-y)+3y=21

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Solution for 3(7-y)+3y=21 equation: 



3(7-y)+3y=21

We move all terms to the left:

3(7-y)+3y-(21)=0

We add all the numbers together, and all the variables

3(-1y+7)+3y-21=0

We add all the numbers together, and all the variables

3y+3(-1y+7)-21=0

We multiply parentheses

3y-3y+21-21=0

We add all the numbers together, and all the variables

=0

y=0/1

y=0

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