90-x=4(180-x)

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



90-x=4(180-x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(4(-1x+180)), so:

4(-1x+180)

We multiply parentheses

-4x+720

Back to the equation:

-(-4x+720)



We get rid of parentheses

-1x+4x-720+90=0

We add all the numbers together, and all the variables

3x-630=0

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

3x=630

x=630/3

x=210

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