-21=-8r+6+5

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Solution for -21=-8r+6+5 equation: 


Simplifying
-21 = -8r + 6 + 5

Reorder the terms:
-21 = 6 + 5 + -8r

Combine like terms: 6 + 5 = 11
-21 = 11 + -8r

Solving
-21 = 11 + -8r

Solving for variable 'r'.

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

Add '8r' to each side of the equation.
-21 + 8r = 11 + -8r + 8r

Combine like terms: -8r + 8r = 0
-21 + 8r = 11 + 0
-21 + 8r = 11

Add '21' to each side of the equation.
-21 + 21 + 8r = 11 + 21

Combine like terms: -21 + 21 = 0
0 + 8r = 11 + 21
8r = 11 + 21

Combine like terms: 11 + 21 = 32
8r = 32

Divide each side by '8'.
r = 4

Simplifying
r = 4

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