21=5a-4

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Solution for 21=5a-4 equation:


Simplifying
21 = 5a + -4

Reorder the terms:
21 = -4 + 5a

Solving
21 = -4 + 5a

Solving for variable 'a'.

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

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

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

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

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

Combine like terms: -4 + -21 = -25
-5a = -25

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

Simplifying
a = 5

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