a+9a=100

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Solution for a+9a=100 equation: 


Simplifying
a + 9a = 100

Combine like terms: a + 9a = 10a
10a = 100

Solving
10a = 100

Solving for variable 'a'.

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

Divide each side by '10'.
a = 10

Simplifying
a = 10

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