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(-3x-1)=(-x-9)
We move all terms to the left:
(-3x-1)-((-x-9))=0
We add all the numbers together, and all the variables
(-3x-1)-((-1x-9))=0
We get rid of parentheses
-3x-((-1x-9))-1=0
We calculate terms in parentheses: -((-1x-9)), so:We get rid of parentheses
(-1x-9)
We get rid of parentheses
-1x-9
Back to the equation:
-(-1x-9)
-3x+1x+9-1=0
We add all the numbers together, and all the variables
-2x+8=0
We move all terms containing x to the left, all other terms to the right
-2x=-8
x=-8/-2
x=+4
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