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x+5x+(12+x)=180
We move all terms to the left:
x+5x+(12+x)-(180)=0
We add all the numbers together, and all the variables
x+5x+(x+12)-180=0
We add all the numbers together, and all the variables
6x+(x+12)-180=0
We get rid of parentheses
6x+x+12-180=0
We add all the numbers together, and all the variables
7x-168=0
We move all terms containing x to the left, all other terms to the right
7x=168
x=168/7
x=24
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