180-x=9+4(90-x)

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Solution for 180-x=9+4(90-x) equation: 



180-x=9+4(90-x)

We move all terms to the left:

180-x-(9+4(90-x))=0

We add all the numbers together, and all the variables

-x-(9+4(-1x+90))+180=0

We add all the numbers together, and all the variables

-1x-(9+4(-1x+90))+180=0



We calculate terms in parentheses: -(9+4(-1x+90)), so:

9+4(-1x+90)

determiningTheFunctionDomain
4(-1x+90)+9

We multiply parentheses

-4x+360+9

We add all the numbers together, and all the variables

-4x+369

Back to the equation:

-(-4x+369)



We get rid of parentheses

-1x+4x-369+180=0

We add all the numbers together, and all the variables

3x-189=0

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

3x=189

x=189/3

x=63

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