4a-5b=21

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Solution for 4a-5b=21 equation: 


Simplifying
4a + -5b = 21

Solving
4a + -5b = 21

Solving for variable 'a'.

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

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

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

Divide each side by '4'.
a = 5.25 + 1.25b

Simplifying
a = 5.25 + 1.25b

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