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6.9+x+x=180
We move all terms to the left:
6.9+x+x-(180)=0
We add all the numbers together, and all the variables
2x-173.1=0
We move all terms containing x to the left, all other terms to the right
2x=173.1
x=173.1/2
x=86+1/1.81818181818
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