9-10r=-8r-9

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Solution for 9-10r=-8r-9 equation:


Simplifying
9 + -10r = -8r + -9

Reorder the terms:
9 + -10r = -9 + -8r

Solving
9 + -10r = -9 + -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.
9 + -10r + 8r = -9 + -8r + 8r

Combine like terms: -10r + 8r = -2r
9 + -2r = -9 + -8r + 8r

Combine like terms: -8r + 8r = 0
9 + -2r = -9 + 0
9 + -2r = -9

Add '-9' to each side of the equation.
9 + -9 + -2r = -9 + -9

Combine like terms: 9 + -9 = 0
0 + -2r = -9 + -9
-2r = -9 + -9

Combine like terms: -9 + -9 = -18
-2r = -18

Divide each side by '-2'.
r = 9

Simplifying
r = 9

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