21=7-2a

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Solution for 21=7-2a equation:


Simplifying
21 = 7 + -2a

Solving
21 = 7 + -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 = 7 + -2a + 2a

Combine like terms: -2a + 2a = 0
21 + 2a = 7 + 0
21 + 2a = 7

Add '-21' to each side of the equation.
21 + -21 + 2a = 7 + -21

Combine like terms: 21 + -21 = 0
0 + 2a = 7 + -21
2a = 7 + -21

Combine like terms: 7 + -21 = -14
2a = -14

Divide each side by '2'.
a = -7

Simplifying
a = -7

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