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180=5x-51+2x
We move all terms to the left:
180-(5x-51+2x)=0
We add all the numbers together, and all the variables
-(7x-51)+180=0
We get rid of parentheses
-7x+51+180=0
We add all the numbers together, and all the variables
-7x+231=0
We move all terms containing x to the left, all other terms to the right
-7x=-231
x=-231/-7
x=+33
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