21r-26=8r-13

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Solution for 21r-26=8r-13 equation:


Simplifying
21r + -26 = 8r + -13

Reorder the terms:
-26 + 21r = 8r + -13

Reorder the terms:
-26 + 21r = -13 + 8r

Solving
-26 + 21r = -13 + 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.
-26 + 21r + -8r = -13 + 8r + -8r

Combine like terms: 21r + -8r = 13r
-26 + 13r = -13 + 8r + -8r

Combine like terms: 8r + -8r = 0
-26 + 13r = -13 + 0
-26 + 13r = -13

Add '26' to each side of the equation.
-26 + 26 + 13r = -13 + 26

Combine like terms: -26 + 26 = 0
0 + 13r = -13 + 26
13r = -13 + 26

Combine like terms: -13 + 26 = 13
13r = 13

Divide each side by '13'.
r = 1

Simplifying
r = 1

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