8a-9a=4

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Solution for 8a-9a=4 equation: 


Simplifying
8a + -9a = 4

Combine like terms: 8a + -9a = -1a
-1a = 4

Solving
-1a = 4

Solving for variable 'a'.

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

Divide each side by '-1'.
a = -4

Simplifying
a = -4

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