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-8x-9=7x+6
We move all terms to the left:
-8x-9-(7x+6)=0
We get rid of parentheses
-8x-7x-6-9=0
We add all the numbers together, and all the variables
-15x-15=0
We move all terms containing x to the left, all other terms to the right
-15x=15
x=15/-15
x=-1
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