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3x+9+8x-6+7x-2=73
We move all terms to the left:
3x+9+8x-6+7x-2-(73)=0
We add all the numbers together, and all the variables
18x-72=0
We move all terms containing x to the left, all other terms to the right
18x=72
x=72/18
x=4
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