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-7=18-x-9x-5
We move all terms to the left:
-7-(18-x-9x-5)=0
We add all the numbers together, and all the variables
-(-10x+13)-7=0
We get rid of parentheses
10x-13-7=0
We add all the numbers together, and all the variables
10x-20=0
We move all terms containing x to the left, all other terms to the right
10x=20
x=20/10
x=2
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