21=2(4a+20)

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Solution for 21=2(4a+20) equation:


Simplifying
21 = 2(4a + 20)

Reorder the terms:
21 = 2(20 + 4a)
21 = (20 * 2 + 4a * 2)
21 = (40 + 8a)

Solving
21 = 40 + 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 = 40 + 8a + -8a

Combine like terms: 8a + -8a = 0
21 + -8a = 40 + 0
21 + -8a = 40

Add '-21' to each side of the equation.
21 + -21 + -8a = 40 + -21

Combine like terms: 21 + -21 = 0
0 + -8a = 40 + -21
-8a = 40 + -21

Combine like terms: 40 + -21 = 19
-8a = 19

Divide each side by '-8'.
a = -2.375

Simplifying
a = -2.375

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