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-1x-4=-8x-9
We move all terms to the left:
-1x-4-(-8x-9)=0
We get rid of parentheses
-1x+8x+9-4=0
We add all the numbers together, and all the variables
7x+5=0
We move all terms containing x to the left, all other terms to the right
7x=-5
x=-5/7
x=-5/7
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