4r-21=15-8n

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Solution for 4r-21=15-8n equation:


Simplifying
4r + -21 = 15 + -8n

Reorder the terms:
-21 + 4r = 15 + -8n

Solving
-21 + 4r = 15 + -8n

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '21' to each side of the equation.
-21 + 21 + 4r = 15 + 21 + -8n

Combine like terms: -21 + 21 = 0
0 + 4r = 15 + 21 + -8n
4r = 15 + 21 + -8n

Combine like terms: 15 + 21 = 36
4r = 36 + -8n

Divide each side by '4'.
r = 9 + -2n

Simplifying
r = 9 + -2n

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