3-x-7=-42

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Solution for 3-x-7=-42 equation: 



3-x-7=-42

We move all terms to the left:

3-x-7-(-42)=0

We add all the numbers together, and all the variables

-1x+38=0

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

-x=-38

x=-38/-1

x=+38

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