-4a+5=21

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Solution for -4a+5=21 equation: 


Simplifying
-4a + 5 = 21

Reorder the terms:
5 + -4a = 21

Solving
5 + -4a = 21

Solving for variable 'a'.

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

Add '-5' to each side of the equation.
5 + -5 + -4a = 21 + -5

Combine like terms: 5 + -5 = 0
0 + -4a = 21 + -5
-4a = 21 + -5

Combine like terms: 21 + -5 = 16
-4a = 16

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

Simplifying
a = -4

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