89=21-r

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Solution for 89=21-r equation:


Simplifying
89 = 21 + -1r

Solving
89 = 21 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
89 + r = 21 + -1r + r

Combine like terms: -1r + r = 0
89 + r = 21 + 0
89 + r = 21

Add '-89' to each side of the equation.
89 + -89 + r = 21 + -89

Combine like terms: 89 + -89 = 0
0 + r = 21 + -89
r = 21 + -89

Combine like terms: 21 + -89 = -68
r = -68

Simplifying
r = -68

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