21x+13=4x-7

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Solution for 21x+13=4x-7 equation: 



21x+13=4x-7

We move all terms to the left:

21x+13-(4x-7)=0

We get rid of parentheses

21x-4x+7+13=0

We add all the numbers together, and all the variables

17x+20=0

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

17x=-20

x=-20/17

x=-1+3/17

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