a=-4a+21

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Solution for a=-4a+21 equation: 


Simplifying
a = -4a + 21

Reorder the terms:
a = 21 + -4a

Solving
a = 21 + -4a

Solving for variable 'a'.

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

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

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

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

Divide each side by '5'.
a = 4.2

Simplifying
a = 4.2

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