9a+10a=21a

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Solution for 9a+10a=21a equation: 


Simplifying
9a + 10a = 21a

Combine like terms: 9a + 10a = 19a
19a = 21a

Solving
19a = 21a

Solving for variable 'a'.

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

Add '-21a' to each side of the equation.
19a + -21a = 21a + -21a

Combine like terms: 19a + -21a = -2a
-2a = 21a + -21a

Combine like terms: 21a + -21a = 0
-2a = 0

Divide each side by '-2'.
a = 0

Simplifying
a = 0

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