5(21-7y)=7y

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Solution for 5(21-7y)=7y equation: 



5(21-7y)=7y

We move all terms to the left:

5(21-7y)-(7y)=0

We add all the numbers together, and all the variables

5(-7y+21)-7y=0

We add all the numbers together, and all the variables

-7y+5(-7y+21)=0

We multiply parentheses

-7y-35y+105=0

We add all the numbers together, and all the variables

-42y+105=0

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

-42y=-105

y=-105/-42

y=2+1/2

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