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3x+77+x+71+3x+77+x+71=360
We move all terms to the left:
3x+77+x+71+3x+77+x+71-(360)=0
We add all the numbers together, and all the variables
8x-64=0
We move all terms containing x to the left, all other terms to the right
8x=64
x=64/8
x=8
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