-1=r+9

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Solution for -1=r+9 equation:


Simplifying
-1 = r + 9

Reorder the terms:
-1 = 9 + r

Solving
-1 = 9 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
-1 + -1r = 9 + r + -1r

Combine like terms: r + -1r = 0
-1 + -1r = 9 + 0
-1 + -1r = 9

Add '1' to each side of the equation.
-1 + 1 + -1r = 9 + 1

Combine like terms: -1 + 1 = 0
0 + -1r = 9 + 1
-1r = 9 + 1

Combine like terms: 9 + 1 = 10
-1r = 10

Divide each side by '-1'.
r = -10

Simplifying
r = -10

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