180-x=6*(90-x)+40.

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Solution for 180-x=6*(90-x)+40. equation: 



180-x=6(90-x)+40.

We move all terms to the left:

180-x-(6(90-x)+40.)=0

We add all the numbers together, and all the variables

-x-(6(-1x+90)+40.)+180=0

We add all the numbers together, and all the variables

-1x-(6(-1x+90)+40.)+180=0



We calculate terms in parentheses: -(6(-1x+90)+40.), so:

6(-1x+90)+40.

We add all the numbers together, and all the variables

6(-1x+90)+40

We multiply parentheses

-6x+540+40

We add all the numbers together, and all the variables

-6x+580

Back to the equation:

-(-6x+580)



We get rid of parentheses

-1x+6x-580+180=0

We add all the numbers together, and all the variables

5x-400=0

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

5x=400

x=400/5

x=80

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