21-13=4(x-5)

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Solution for 21-13=4(x-5) equation: 



21-13=4(x-5)

We move all terms to the left:

21-13-(4(x-5))=0

We add all the numbers together, and all the variables

-(4(x-5))+8=0



We calculate terms in parentheses: -(4(x-5)), so:

4(x-5)

We multiply parentheses

4x-20

Back to the equation:

-(4x-20)



We get rid of parentheses

-4x+20+8=0

We add all the numbers together, and all the variables

-4x+28=0

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

-4x=-28

x=-28/-4

x=+7

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