3*(-13)=x

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Solution for 3*(-13)=x equation: 



3(-13)=x

We move all terms to the left:

3(-13)-(x)=0

We add all the numbers together, and all the variables

-1x-39=0

We move all terms containing x to the left, all other terms to the right

-x=39

x=39/-1

x=-39

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