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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