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9=-x-3x-7
We move all terms to the left:
9-(-x-3x-7)=0
We add all the numbers together, and all the variables
-(-4x-7)+9=0
We get rid of parentheses
4x+7+9=0
We add all the numbers together, and all the variables
4x+16=0
We move all terms containing x to the left, all other terms to the right
4x=-16
x=-16/4
x=-4
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