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180-(42+x)=3x

We move all terms to the left:

180-(42+x)-(3x)=0

We add all the numbers together, and all the variables

-(x+42)-3x+180=0

We add all the numbers together, and all the variables

-3x-(x+42)+180=0

We get rid of parentheses

-3x-x-42+180=0

We add all the numbers together, and all the variables

-4x+138=0

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

-4x=-138

x=-138/-4

x=34+1/2

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