[a+5]=7

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Solution for [a+5]=7 equation: 


Simplifying
[a + 5] = 7

Reorder the terms:
[5 + a] = 7

Remove brackets around [5 + a]
5 + a = 7

Solving
5 + a = 7

Solving for variable 'a'.

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

Add '-5' to each side of the equation.
5 + -5 + a = 7 + -5

Combine like terms: 5 + -5 = 0
0 + a = 7 + -5
a = 7 + -5

Combine like terms: 7 + -5 = 2
a = 2

Simplifying
a = 2

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