90-x=180-4x

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Solution for 90-x=180-4x equation: 



90-x=180-4x

We move all terms to the left:

90-x-(180-4x)=0

We add all the numbers together, and all the variables

-x-(-4x+180)+90=0

We add all the numbers together, and all the variables

-1x-(-4x+180)+90=0

We get rid of parentheses

-1x+4x-180+90=0

We add all the numbers together, and all the variables

3x-90=0

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

3x=90

x=90/3

x=30

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