21=9-2(4a+2)

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Solution for 21=9-2(4a+2) equation:


Simplifying
21 = 9 + -2(4a + 2)

Reorder the terms:
21 = 9 + -2(2 + 4a)
21 = 9 + (2 * -2 + 4a * -2)
21 = 9 + (-4 + -8a)

Combine like terms: 9 + -4 = 5
21 = 5 + -8a

Solving
21 = 5 + -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 = 5 + -8a + 8a

Combine like terms: -8a + 8a = 0
21 + 8a = 5 + 0
21 + 8a = 5

Add '-21' to each side of the equation.
21 + -21 + 8a = 5 + -21

Combine like terms: 21 + -21 = 0
0 + 8a = 5 + -21
8a = 5 + -21

Combine like terms: 5 + -21 = -16
8a = -16

Divide each side by '8'.
a = -2

Simplifying
a = -2

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