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3x-39+3x-39+3x+39=180
We move all terms to the left:
3x-39+3x-39+3x+39-(180)=0
We add all the numbers together, and all the variables
9x-219=0
We move all terms containing x to the left, all other terms to the right
9x=219
x=219/9
x=24+1/3
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