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x+3x+3+x+3x-5=320
We move all terms to the left:
x+3x+3+x+3x-5-(320)=0
We add all the numbers together, and all the variables
8x-322=0
We move all terms containing x to the left, all other terms to the right
8x=322
x=322/8
x=40+1/4
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