13-8r-9=25

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Solution for 13-8r-9=25 equation:


Simplifying
13 + -8r + -9 = 25

Reorder the terms:
13 + -9 + -8r = 25

Combine like terms: 13 + -9 = 4
4 + -8r = 25

Solving
4 + -8r = 25

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + -8r = 25 + -4

Combine like terms: 4 + -4 = 0
0 + -8r = 25 + -4
-8r = 25 + -4

Combine like terms: 25 + -4 = 21
-8r = 21

Divide each side by '-8'.
r = -2.625

Simplifying
r = -2.625

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