13+7=100-x

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Solution for 13+7=100-x equation: 



13+7=100-x

We move all terms to the left:

13+7-(100-x)=0

We add all the numbers together, and all the variables

-(-1x+100)+13+7=0

We add all the numbers together, and all the variables

-(-1x+100)+20=0

We get rid of parentheses

1x-100+20=0

We add all the numbers together, and all the variables

x-80=0

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

x=80

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