10=90-4x

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Solution for 10=90-4x equation: 



10=90-4x

We move all terms to the left:

10-(90-4x)=0

We add all the numbers together, and all the variables

-(-4x+90)+10=0

We get rid of parentheses

4x-90+10=0

We add all the numbers together, and all the variables

4x-80=0

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

4x=80

x=80/4

x=20

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