4+a+2=21-2a

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Solution for 4+a+2=21-2a equation:


Simplifying
4 + a + 2 = 21 + -2a

Reorder the terms:
4 + 2 + a = 21 + -2a

Combine like terms: 4 + 2 = 6
6 + a = 21 + -2a

Solving
6 + a = 21 + -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
6 + a + 2a = 21 + -2a + 2a

Combine like terms: a + 2a = 3a
6 + 3a = 21 + -2a + 2a

Combine like terms: -2a + 2a = 0
6 + 3a = 21 + 0
6 + 3a = 21

Add '-6' to each side of the equation.
6 + -6 + 3a = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 3a = 21 + -6
3a = 21 + -6

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

Divide each side by '3'.
a = 5

Simplifying
a = 5

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