a-7=-21

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Solution for a-7=-21 equation: 


Simplifying
a + -7 = -21

Reorder the terms:
-7 + a = -21

Solving
-7 + a = -21

Solving for variable 'a'.

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

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

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

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

Simplifying
a = -14

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