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x+(x+6)+(x+21)=180
We move all terms to the left:
x+(x+6)+(x+21)-(180)=0
We get rid of parentheses
x+x+x+6+21-180=0
We add all the numbers together, and all the variables
3x-153=0
We move all terms containing x to the left, all other terms to the right
3x=153
x=153/3
x=51
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