r-1=-9

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Solution for r-1=-9 equation: 


Simplifying
r + -1 = -9

Reorder the terms:
-1 + r = -9

Solving
-1 + r = -9

Solving for variable 'r'.

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

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

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

Combine like terms: -9 + 1 = -8
r = -8

Simplifying
r = -8

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