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9+8x-7x=9+1
We move all terms to the left:
9+8x-7x-(9+1)=0
We add all the numbers together, and all the variables
8x-7x+9-10=0
We add all the numbers together, and all the variables
x-1=0
We move all terms containing x to the left, all other terms to the right
x=1
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