21=5-2r

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Solution for 21=5-2r equation:


Simplifying
21 = 5 + -2r

Solving
21 = 5 + -2r

Solving for variable 'r'.

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

Add '2r' to each side of the equation.
21 + 2r = 5 + -2r + 2r

Combine like terms: -2r + 2r = 0
21 + 2r = 5 + 0
21 + 2r = 5

Add '-21' to each side of the equation.
21 + -21 + 2r = 5 + -21

Combine like terms: 21 + -21 = 0
0 + 2r = 5 + -21
2r = 5 + -21

Combine like terms: 5 + -21 = -16
2r = -16

Divide each side by '2'.
r = -8

Simplifying
r = -8

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