x+(90-3x)=180

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Solution for x+(90-3x)=180 equation: 



x+(90-3x)=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

x-3x+90-180=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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