21=2(4a+2)

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Solution for 21=2(4a+2) equation:


Simplifying
21 = 2(4a + 2)

Reorder the terms:
21 = 2(2 + 4a)
21 = (2 * 2 + 4a * 2)
21 = (4 + 8a)

Solving
21 = 4 + 8a

Solving for variable 'a'.

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

Add '-8a' to each side of the equation.
21 + -8a = 4 + 8a + -8a

Combine like terms: 8a + -8a = 0
21 + -8a = 4 + 0
21 + -8a = 4

Add '-21' to each side of the equation.
21 + -21 + -8a = 4 + -21

Combine like terms: 21 + -21 = 0
0 + -8a = 4 + -21
-8a = 4 + -21

Combine like terms: 4 + -21 = -17
-8a = -17

Divide each side by '-8'.
a = 2.125

Simplifying
a = 2.125

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