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18=-2(-x-4)
We move all terms to the left:
18-(-2(-x-4))=0
We add all the numbers together, and all the variables
-(-2(-1x-4))+18=0
We calculate terms in parentheses: -(-2(-1x-4)), so:We get rid of parentheses
-2(-1x-4)
We multiply parentheses
2x+8
Back to the equation:
-(2x+8)
-2x-8+18=0
We add all the numbers together, and all the variables
-2x+10=0
We move all terms containing x to the left, all other terms to the right
-2x=-10
x=-10/-2
x=+5
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