7x+21=91-7x

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Solution for 7x+21=91-7x equation: 



7x+21=91-7x

We move all terms to the left:

7x+21-(91-7x)=0

We add all the numbers together, and all the variables

7x-(-7x+91)+21=0

We get rid of parentheses

7x+7x-91+21=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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