a+2(a+2)=16

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Solution for a+2(a+2)=16 equation: 


Simplifying
a + 2(a + 2) = 16

Reorder the terms:
a + 2(2 + a) = 16
a + (2 * 2 + a * 2) = 16
a + (4 + 2a) = 16

Reorder the terms:
4 + a + 2a = 16

Combine like terms: a + 2a = 3a
4 + 3a = 16

Solving
4 + 3a = 16

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 + 3a = 16 + -4

Combine like terms: 4 + -4 = 0
0 + 3a = 16 + -4
3a = 16 + -4

Combine like terms: 16 + -4 = 12
3a = 12

Divide each side by '3'.
a = 4

Simplifying
a = 4

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