a=0.9*a

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Solution for a=0.9*a equation: 


Simplifying
a = 0.9a

Solving
a = 0.9a

Solving for variable 'a'.

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

Add '-0.9a' to each side of the equation.
a + -0.9a = 0.9a + -0.9a

Combine like terms: a + -0.9a = 0.1a
0.1a = 0.9a + -0.9a

Combine like terms: 0.9a + -0.9a = 0.0
0.1a = 0.0

Divide each side by '0.1'.
a = 0

Simplifying
a = 0

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