2(a+2)=21.4

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Solution for 2(a+2)=21.4 equation: 


Simplifying
2(a + 2) = 21.4

Reorder the terms:
2(2 + a) = 21.4
(2 * 2 + a * 2) = 21.4
(4 + 2a) = 21.4

Solving
4 + 2a = 21.4

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + 2a = 21.4 + -4

Combine like terms: 4 + -4 = 0
0 + 2a = 21.4 + -4
2a = 21.4 + -4

Combine like terms: 21.4 + -4 = 17.4
2a = 17.4

Divide each side by '2'.
a = 8.7

Simplifying
a = 8.7

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