2r-21=27+8r

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Solution for 2r-21=27+8r equation:


Simplifying
2r + -21 = 27 + 8r

Reorder the terms:
-21 + 2r = 27 + 8r

Solving
-21 + 2r = 27 + 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 + 2r + -8r = 27 + 8r + -8r

Combine like terms: 2r + -8r = -6r
-21 + -6r = 27 + 8r + -8r

Combine like terms: 8r + -8r = 0
-21 + -6r = 27 + 0
-21 + -6r = 27

Add '21' to each side of the equation.
-21 + 21 + -6r = 27 + 21

Combine like terms: -21 + 21 = 0
0 + -6r = 27 + 21
-6r = 27 + 21

Combine like terms: 27 + 21 = 48
-6r = 48

Divide each side by '-6'.
r = -8

Simplifying
r = -8

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