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180-(3x+12)=180-(3(21)+12)
We move all terms to the left:
180-(3x+12)-(180-(3(21)+12))=0
We add all the numbers together, and all the variables
-(3x+12)+180-(180-333)=0
We add all the numbers together, and all the variables
-(3x+12)+333=0
We get rid of parentheses
-3x-12+333=0
We add all the numbers together, and all the variables
-3x+321=0
We move all terms containing x to the left, all other terms to the right
-3x=-321
x=-321/-3
x=+107
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