3(21+y)=180

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Solution for 3(21+y)=180 equation: 



3(21+y)=180

We move all terms to the left:

3(21+y)-(180)=0

We add all the numbers together, and all the variables

3(y+21)-180=0

We multiply parentheses

3y+63-180=0

We add all the numbers together, and all the variables

3y-117=0

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

3y=117

y=117/3

y=39

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