21-7a=0

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Solution for 21-7a=0 equation: 


Simplifying
21 + -7a = 0

Solving
21 + -7a = 0

Solving for variable 'a'.

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

Add '-21' to each side of the equation.
21 + -21 + -7a = 0 + -21

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

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

Divide each side by '-7'.
a = 3

Simplifying
a = 3

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