a-4b=21

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Solution for a-4b=21 equation: 


Simplifying
a + -4b = 21

Solving
a + -4b = 21

Solving for variable 'a'.

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

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

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

Simplifying
a = 21 + 4b

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