3[A+5]=21

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Solution for 3[A+5]=21 equation: 


Simplifying
3[A + 5] = 21

Reorder the terms:
3[5 + A] = 21
[5 * 3 + A * 3] = 21
[15 + 3A] = 21

Solving
15 + 3A = 21

Solving for variable 'A'.

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

Add '-15' to each side of the equation.
15 + -15 + 3A = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 3A = 21 + -15
3A = 21 + -15

Combine like terms: 21 + -15 = 6
3A = 6

Divide each side by '3'.
A = 2

Simplifying
A = 2

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