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(-x)+(-3)=-13
We move all terms to the left:
(-x)+(-3)-(-13)=0
We add all the numbers together, and all the variables
(-1x)+(-3)-(-13)=0
We add all the numbers together, and all the variables
(-1x)+10=0
We get rid of parentheses
-1x+10=0
We move all terms containing x to the left, all other terms to the right
-x=-10
x=-10/-1
x=+10
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