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3x+15+15x+10+15x-10=180
We move all terms to the left:
3x+15+15x+10+15x-10-(180)=0
We add all the numbers together, and all the variables
33x-165=0
We move all terms containing x to the left, all other terms to the right
33x=165
x=165/33
x=5
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