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