21=6r+5-r

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


Simplifying
21 = 6r + 5 + -1r

Reorder the terms:
21 = 5 + 6r + -1r

Combine like terms: 6r + -1r = 5r
21 = 5 + 5r

Solving
21 = 5 + 5r

Solving for variable 'r'.

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

Add '-5r' to each side of the equation.
21 + -5r = 5 + 5r + -5r

Combine like terms: 5r + -5r = 0
21 + -5r = 5 + 0
21 + -5r = 5

Add '-21' to each side of the equation.
21 + -21 + -5r = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -5r = 5 + -21
-5r = 5 + -21

Combine like terms: 5 + -21 = -16
-5r = -16

Divide each side by '-5'.
r = 3.2

Simplifying
r = 3.2

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