[r+2]=6

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Solution for [r+2]=6 equation: 


Simplifying
[r + 2] = 6

Reorder the terms:
[2 + r] = 6

Remove brackets around [2 + r]
2 + r = 6

Solving
2 + r = 6

Solving for variable 'r'.

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

Add '-2' to each side of the equation.
2 + -2 + r = 6 + -2

Combine like terms: 2 + -2 = 0
0 + r = 6 + -2
r = 6 + -2

Combine like terms: 6 + -2 = 4
r = 4

Simplifying
r = 4

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