-4a-21=-1

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Solution for -4a-21=-1 equation: 


Simplifying
-4a + -21 = -1

Reorder the terms:
-21 + -4a = -1

Solving
-21 + -4a = -1

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 + -4a = -1 + 21

Combine like terms: -21 + 21 = 0
0 + -4a = -1 + 21
-4a = -1 + 21

Combine like terms: -1 + 21 = 20
-4a = 20

Divide each side by '-4'.
a = -5

Simplifying
a = -5

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