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180-(4x+9)+2x+(3x-12)=180
We move all terms to the left:
180-(4x+9)+2x+(3x-12)-(180)=0
We add all the numbers together, and all the variables
2x-(4x+9)+(3x-12)=0
We get rid of parentheses
2x-4x+3x-9-12=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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