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3x-8+9x-2+5x+3=180
We move all terms to the left:
3x-8+9x-2+5x+3-(180)=0
We add all the numbers together, and all the variables
17x-187=0
We move all terms containing x to the left, all other terms to the right
17x=187
x=187/17
x=11
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