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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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



We calculate terms in parentheses: -(3(-1x+90)), so:

3(-1x+90)

We multiply parentheses

-3x+270

Back to the equation:

-(-3x+270)



We get rid of parentheses

-1x+3x-270+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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