3a(-b)=9

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Solution for 3a(-b)=9 equation: 


Simplifying
3a(-1b) = 9

Remove parenthesis around (-1b)
3a * -1b = 9

Reorder the terms for easier multiplication:
3 * -1a * b = 9

Multiply 3 * -1
-3a * b = 9

Multiply a * b
-3ab = 9

Solving
-3ab = 9

Solving for variable 'a'.

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

Divide each side by '-3b'.
a = -3b-1

Simplifying
a = -3b-1

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