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x+3x+(12+x*2)=180
We move all terms to the left:
x+3x+(12+x*2)-(180)=0
We add all the numbers together, and all the variables
x+3x+(x*2+12)-180=0
We add all the numbers together, and all the variables
4x+(x*2+12)-180=0
We get rid of parentheses
4x+x*2+12-180=0
We add all the numbers together, and all the variables
4x+x*2-168=0
Wy multiply elements
4x+2x-168=0
We add all the numbers together, and all the variables
6x-168=0
We move all terms containing x to the left, all other terms to the right
6x=168
x=168/6
x=28
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