7(3x-7)=7x+21

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



7(3x-7)=7x+21

We move all terms to the left:

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

We multiply parentheses

21x-(7x+21)-49=0

We get rid of parentheses

21x-7x-21-49=0

We add all the numbers together, and all the variables

14x-70=0

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

14x=70

x=70/14

x=5

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