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180+30x=200+20x
We move all terms to the left:
180+30x-(200+20x)=0
We add all the numbers together, and all the variables
30x-(20x+200)+180=0
We get rid of parentheses
30x-20x-200+180=0
We add all the numbers together, and all the variables
10x-20=0
We move all terms containing x to the left, all other terms to the right
10x=20
x=20/10
x=2
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