4a+23-9a=21

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Solution for 4a+23-9a=21 equation: 


Simplifying
4a + 23 + -9a = 21

Reorder the terms:
23 + 4a + -9a = 21

Combine like terms: 4a + -9a = -5a
23 + -5a = 21

Solving
23 + -5a = 21

Solving for variable 'a'.

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

Add '-23' to each side of the equation.
23 + -23 + -5a = 21 + -23

Combine like terms: 23 + -23 = 0
0 + -5a = 21 + -23
-5a = 21 + -23

Combine like terms: 21 + -23 = -2
-5a = -2

Divide each side by '-5'.
a = 0.4

Simplifying
a = 0.4

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