x-13=3x+7

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



x-13=3x+7

We move all terms to the left:

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

We get rid of parentheses

x-3x-7-13=0

We add all the numbers together, and all the variables

-2x-20=0

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

-2x=20

x=20/-2

x=-10

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