180-x=3*(90-x)+40

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Solution for 180-x=3*(90-x)+40 equation: 



180-x=3(90-x)+40

We move all terms to the left:

180-x-(3(90-x)+40)=0

We add all the numbers together, and all the variables

-x-(3(-1x+90)+40)+180=0

We add all the numbers together, and all the variables

-1x-(3(-1x+90)+40)+180=0



We calculate terms in parentheses: -(3(-1x+90)+40), so:

3(-1x+90)+40

We multiply parentheses

-3x+270+40

We add all the numbers together, and all the variables

-3x+310

Back to the equation:

-(-3x+310)



We get rid of parentheses

-1x+3x-310+180=0

We add all the numbers together, and all the variables

2x-130=0

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

2x=130

x=130/2

x=65

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