-3-4a=21

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Solution for -3-4a=21 equation: 


Simplifying
-3 + -4a = 21

Solving
-3 + -4a = 21

Solving for variable 'a'.

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

Add '3' to each side of the equation.
-3 + 3 + -4a = 21 + 3

Combine like terms: -3 + 3 = 0
0 + -4a = 21 + 3
-4a = 21 + 3

Combine like terms: 21 + 3 = 24
-4a = 24

Divide each side by '-4'.
a = -6

Simplifying
a = -6

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