21=2a+(5+a)

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Solution for 21=2a+(5+a) equation:


Simplifying
21 = 2a + (5 + a)

Remove parenthesis around (5 + a)
21 = 2a + 5 + a

Reorder the terms:
21 = 5 + 2a + a

Combine like terms: 2a + a = 3a
21 = 5 + 3a

Solving
21 = 5 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
21 + -3a = 5 + 3a + -3a

Combine like terms: 3a + -3a = 0
21 + -3a = 5 + 0
21 + -3a = 5

Add '-21' to each side of the equation.
21 + -21 + -3a = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -3a = 5 + -21
-3a = 5 + -21

Combine like terms: 5 + -21 = -16
-3a = -16

Divide each side by '-3'.
a = 5.333333333

Simplifying
a = 5.333333333

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