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3x+13+3x+8+9x-15=180
We move all terms to the left:
3x+13+3x+8+9x-15-(180)=0
We add all the numbers together, and all the variables
15x-174=0
We move all terms containing x to the left, all other terms to the right
15x=174
x=174/15
x=11+3/5
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