20=13+4x+3x

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Solution for 20=13+4x+3x equation: 



20=13+4x+3x

We move all terms to the left:

20-(13+4x+3x)=0

We add all the numbers together, and all the variables

-(7x+13)+20=0

We get rid of parentheses

-7x-13+20=0

We add all the numbers together, and all the variables

-7x+7=0

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

-7x=-7

x=-7/-7

x=1

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