9=-3(6+a)

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Solution for 9=-3(6+a) equation: 


Simplifying
9 = -3(6 + a)
9 = (6 * -3 + a * -3)
9 = (-18 + -3a)

Solving
9 = -18 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
9 + 3a = -18 + -3a + 3a

Combine like terms: -3a + 3a = 0
9 + 3a = -18 + 0
9 + 3a = -18

Add '-9' to each side of the equation.
9 + -9 + 3a = -18 + -9

Combine like terms: 9 + -9 = 0
0 + 3a = -18 + -9
3a = -18 + -9

Combine like terms: -18 + -9 = -27
3a = -27

Divide each side by '3'.
a = -9

Simplifying
a = -9

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