90-x=180-3x

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Solution for 90-x=180-3x equation: 



90-x=180-3x

We move all terms to the left:

90-x-(180-3x)=0

We add all the numbers together, and all the variables

-x-(-3x+180)+90=0

We add all the numbers together, and all the variables

-1x-(-3x+180)+90=0

We get rid of parentheses

-1x+3x-180+90=0

We add all the numbers together, and all the variables

2x-90=0

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

2x=90

x=90/2

x=45

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