21-5n=-4(2n-3)

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Solution for 21-5n=-4(2n-3) equation: 



21-5n=-4(2n-3)

We move all terms to the left:

21-5n-(-4(2n-3))=0



We calculate terms in parentheses: -(-4(2n-3)), so:

-4(2n-3)

We multiply parentheses

-8n+12

Back to the equation:

-(-8n+12)



We get rid of parentheses

-5n+8n-12+21=0

We add all the numbers together, and all the variables

3n+9=0

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

3n=-9

n=-9/3

n=-3

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