4a=5a-21

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Solution for 4a=5a-21 equation: 


Simplifying
4a = 5a + -21

Reorder the terms:
4a = -21 + 5a

Solving
4a = -21 + 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.
4a + -5a = -21 + 5a + -5a

Combine like terms: 4a + -5a = -1a
-1a = -21 + 5a + -5a

Combine like terms: 5a + -5a = 0
-1a = -21 + 0
-1a = -21

Divide each side by '-1'.
a = 21

Simplifying
a = 21

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