20=90-7x

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Solution for 20=90-7x equation: 



20=90-7x

We move all terms to the left:

20-(90-7x)=0

We add all the numbers together, and all the variables

-(-7x+90)+20=0

We get rid of parentheses

7x-90+20=0

We add all the numbers together, and all the variables

7x-70=0

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

7x=70

x=70/7

x=10

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