180-x=4(90-x)-135

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Solution for 180-x=4(90-x)-135 equation: 



180-x=4(90-x)-135

We move all terms to the left:

180-x-(4(90-x)-135)=0

We add all the numbers together, and all the variables

-x-(4(-1x+90)-135)+180=0

We add all the numbers together, and all the variables

-1x-(4(-1x+90)-135)+180=0



We calculate terms in parentheses: -(4(-1x+90)-135), so:

4(-1x+90)-135

We multiply parentheses

-4x+360-135

We add all the numbers together, and all the variables

-4x+225

Back to the equation:

-(-4x+225)



We get rid of parentheses

-1x+4x-225+180=0

We add all the numbers together, and all the variables

3x-45=0

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

3x=45

x=45/3

x=15

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