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2x+(3x+45)=180
We move all terms to the left:
2x+(3x+45)-(180)=0
We get rid of parentheses
2x+3x+45-180=0
We add all the numbers together, and all the variables
5x-135=0
We move all terms containing x to the left, all other terms to the right
5x=135
x=135/5
x=27
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