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180=3x+72+4x
We move all terms to the left:
180-(3x+72+4x)=0
We add all the numbers together, and all the variables
-(7x+72)+180=0
We get rid of parentheses
-7x-72+180=0
We add all the numbers together, and all the variables
-7x+108=0
We move all terms containing x to the left, all other terms to the right
-7x=-108
x=-108/-7
x=15+3/7
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