-8r-9-6r=21

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Solution for -8r-9-6r=21 equation:


Simplifying
-8r + -9 + -6r = 21

Reorder the terms:
-9 + -8r + -6r = 21

Combine like terms: -8r + -6r = -14r
-9 + -14r = 21

Solving
-9 + -14r = 21

Solving for variable 'r'.

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

Add '9' to each side of the equation.
-9 + 9 + -14r = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -14r = 21 + 9
-14r = 21 + 9

Combine like terms: 21 + 9 = 30
-14r = 30

Divide each side by '-14'.
r = -2.142857143

Simplifying
r = -2.142857143

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