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7x+15+180-8x+180-8x=180
We move all terms to the left:
7x+15+180-8x+180-8x-(180)=0
We add all the numbers together, and all the variables
-9x+195=0
We move all terms containing x to the left, all other terms to the right
-9x=-195
x=-195/-9
x=21+2/3
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