r-8=-11

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Solution for r-8=-11 equation: 


Simplifying
r + -8 = -11

Reorder the terms:
-8 + r = -11

Solving
-8 + r = -11

Solving for variable 'r'.

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

Add '8' to each side of the equation.
-8 + 8 + r = -11 + 8

Combine like terms: -8 + 8 = 0
0 + r = -11 + 8
r = -11 + 8

Combine like terms: -11 + 8 = -3
r = -3

Simplifying
r = -3

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