[r-9]=-3

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Solution for [r-9]=-3 equation: 


Simplifying
[r + -9] = -3

Reorder the terms:
[-9 + r] = -3

Remove brackets around [-9 + r]
-9 + r = -3

Solving
-9 + r = -3

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 + r = -3 + 9

Combine like terms: -9 + 9 = 0
0 + r = -3 + 9
r = -3 + 9

Combine like terms: -3 + 9 = 6
r = 6

Simplifying
r = 6

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