(40+2(90-x))=180

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Solution for (40+2(90-x))=180 equation: 



(40+2(90-x))=180

We move all terms to the left:

(40+2(90-x))-(180)=0

We add all the numbers together, and all the variables

(40+2(-1x+90))-180=0



We calculate terms in parentheses: +(40+2(-1x+90)), so:

40+2(-1x+90)

determiningTheFunctionDomain
2(-1x+90)+40

We multiply parentheses

-2x+180+40

We add all the numbers together, and all the variables

-2x+220

Back to the equation:

+(-2x+220)



We get rid of parentheses

-2x+220-180=0

We add all the numbers together, and all the variables

-2x+40=0

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

-2x=-40

x=-40/-2

x=+20

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