21x=8x-4(5-2x)

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Solution for 21x=8x-4(5-2x) equation: 



21x=8x-4(5-2x)

We move all terms to the left:

21x-(8x-4(5-2x))=0

We add all the numbers together, and all the variables

21x-(8x-4(-2x+5))=0



We calculate terms in parentheses: -(8x-4(-2x+5)), so:

8x-4(-2x+5)

We multiply parentheses

8x+8x-20

We add all the numbers together, and all the variables

16x-20

Back to the equation:

-(16x-20)



We get rid of parentheses

21x-16x+20=0

We add all the numbers together, and all the variables

5x+20=0

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

5x=-20

x=-20/5

x=-4

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