21=4r-5

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Solution for 21=4r-5 equation:


Simplifying
21 = 4r + -5

Reorder the terms:
21 = -5 + 4r

Solving
21 = -5 + 4r

Solving for variable 'r'.

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

Add '-4r' to each side of the equation.
21 + -4r = -5 + 4r + -4r

Combine like terms: 4r + -4r = 0
21 + -4r = -5 + 0
21 + -4r = -5

Add '-21' to each side of the equation.
21 + -21 + -4r = -5 + -21

Combine like terms: 21 + -21 = 0
0 + -4r = -5 + -21
-4r = -5 + -21

Combine like terms: -5 + -21 = -26
-4r = -26

Divide each side by '-4'.
r = 6.5

Simplifying
r = 6.5

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