7+x=3x+13

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Solution for 7+x=3x+13 equation: 



7+x=3x+13

We move all terms to the left:

7+x-(3x+13)=0

We get rid of parentheses

x-3x-13+7=0

We add all the numbers together, and all the variables

-2x-6=0

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

-2x=6

x=6/-2

x=-3

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