-21=-6+a

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Solution for -21=-6+a equation: 


Simplifying
-21 = -6 + a

Solving
-21 = -6 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-21 + -1a = -6 + a + -1a

Combine like terms: a + -1a = 0
-21 + -1a = -6 + 0
-21 + -1a = -6

Add '21' to each side of the equation.
-21 + 21 + -1a = -6 + 21

Combine like terms: -21 + 21 = 0
0 + -1a = -6 + 21
-1a = -6 + 21

Combine like terms: -6 + 21 = 15
-1a = 15

Divide each side by '-1'.
a = -15

Simplifying
a = -15

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