[r+3]=1

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Solution for [r+3]=1 equation: 


Simplifying
[r + 3] = 1

Reorder the terms:
[3 + r] = 1

Remove brackets around [3 + r]
3 + r = 1

Solving
3 + r = 1

Solving for variable 'r'.

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

Add '-3' to each side of the equation.
3 + -3 + r = 1 + -3

Combine like terms: 3 + -3 = 0
0 + r = 1 + -3
r = 1 + -3

Combine like terms: 1 + -3 = -2
r = -2

Simplifying
r = -2

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