4a-(-9)a=

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Solution for 4a-(-9)a= equation: 


Simplifying
4a + -1(-9) * a = 0

Multiply -1 * -9
4a + 9a = 0

Combine like terms: 4a + 9a = 13a
13a = 0

Solving
13a = 0

Solving for variable 'a'.

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

Divide each side by '13'.
a = 0

Simplifying
a = 0

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