13x+3=7+21x

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Solution for 13x+3=7+21x equation: 



13x+3=7+21x

We move all terms to the left:

13x+3-(7+21x)=0

We add all the numbers together, and all the variables

13x-(21x+7)+3=0

We get rid of parentheses

13x-21x-7+3=0

We add all the numbers together, and all the variables

-8x-4=0

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

-8x=4

x=4/-8

x=-1/2

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