21+9r=20+8r

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Solution for 21+9r=20+8r equation:


Simplifying
21 + 9r = 20 + 8r

Solving
21 + 9r = 20 + 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 + 9r + -8r = 20 + 8r + -8r

Combine like terms: 9r + -8r = 1r
21 + 1r = 20 + 8r + -8r

Combine like terms: 8r + -8r = 0
21 + 1r = 20 + 0
21 + 1r = 20

Add '-21' to each side of the equation.
21 + -21 + 1r = 20 + -21

Combine like terms: 21 + -21 = 0
0 + 1r = 20 + -21
1r = 20 + -21

Combine like terms: 20 + -21 = -1
1r = -1

Divide each side by '1'.
r = -1

Simplifying
r = -1

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