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2x+45=180-2x+45-3x-20
We move all terms to the left:
2x+45-(180-2x+45-3x-20)=0
We add all the numbers together, and all the variables
2x-(-5x+205)+45=0
We get rid of parentheses
2x+5x-205+45=0
We add all the numbers together, and all the variables
7x-160=0
We move all terms containing x to the left, all other terms to the right
7x=160
x=160/7
x=22+6/7
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