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2x+(2x+45)=180
We move all terms to the left:
2x+(2x+45)-(180)=0
We get rid of parentheses
2x+2x+45-180=0
We add all the numbers together, and all the variables
4x-135=0
We move all terms containing x to the left, all other terms to the right
4x=135
x=135/4
x=33+3/4
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