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180=30+3x+x
We move all terms to the left:
180-(30+3x+x)=0
We add all the numbers together, and all the variables
-(4x+30)+180=0
We get rid of parentheses
-4x-30+180=0
We add all the numbers together, and all the variables
-4x+150=0
We move all terms containing x to the left, all other terms to the right
-4x=-150
x=-150/-4
x=37+1/2
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