21=14-7a

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Solution for 21=14-7a equation:


Simplifying
21 = 14 + -7a

Solving
21 = 14 + -7a

Solving for variable 'a'.

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

Add '7a' to each side of the equation.
21 + 7a = 14 + -7a + 7a

Combine like terms: -7a + 7a = 0
21 + 7a = 14 + 0
21 + 7a = 14

Add '-21' to each side of the equation.
21 + -21 + 7a = 14 + -21

Combine like terms: 21 + -21 = 0
0 + 7a = 14 + -21
7a = 14 + -21

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

Divide each side by '7'.
a = -1

Simplifying
a = -1

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