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-7x-4=2x-9-10x
We move all terms to the left:
-7x-4-(2x-9-10x)=0
We add all the numbers together, and all the variables
-7x-(-8x-9)-4=0
We get rid of parentheses
-7x+8x+9-4=0
We add all the numbers together, and all the variables
x+5=0
We move all terms containing x to the left, all other terms to the right
x=-5
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