1-4a=21

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Solution for 1-4a=21 equation: 


Simplifying
1 + -4a = 21

Solving
1 + -4a = 21

Solving for variable 'a'.

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

Add '-1' to each side of the equation.
1 + -1 + -4a = 21 + -1

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

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

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

Simplifying
a = -5

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