[r+8]=5

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Solution for [r+8]=5 equation: 


Simplifying
[r + 8] = 5

Reorder the terms:
[8 + r] = 5

Remove brackets around [8 + r]
8 + r = 5

Solving
8 + r = 5

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 = 5 + -8

Combine like terms: 8 + -8 = 0
0 + r = 5 + -8
r = 5 + -8

Combine like terms: 5 + -8 = -3
r = -3

Simplifying
r = -3

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