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2x+6+2x+9+2x+15=180
We move all terms to the left:
2x+6+2x+9+2x+15-(180)=0
We add all the numbers together, and all the variables
6x-150=0
We move all terms containing x to the left, all other terms to the right
6x=150
x=150/6
x=25
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