21=5+2a

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Solution for 21=5+2a equation:


Simplifying
21 = 5 + 2a

Solving
21 = 5 + 2a

Solving for variable 'a'.

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

Add '-2a' to each side of the equation.
21 + -2a = 5 + 2a + -2a

Combine like terms: 2a + -2a = 0
21 + -2a = 5 + 0
21 + -2a = 5

Add '-21' to each side of the equation.
21 + -21 + -2a = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -2a = 5 + -21
-2a = 5 + -21

Combine like terms: 5 + -21 = -16
-2a = -16

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

Simplifying
a = 8

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