5a-b=21

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Solution for 5a-b=21 equation: 


Simplifying
5a + -1b = 21

Solving
5a + -1b = 21

Solving for variable 'a'.

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

Add 'b' to each side of the equation.
5a + -1b + b = 21 + b

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

Divide each side by '5'.
a = 4.2 + 0.2b

Simplifying
a = 4.2 + 0.2b

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