-3(a+9)=12(a-1)

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Solution for -3(a+9)=12(a-1) equation:


Simplifying
-3(a + 9) = 12(a + -1)

Reorder the terms:
-3(9 + a) = 12(a + -1)
(9 * -3 + a * -3) = 12(a + -1)
(-27 + -3a) = 12(a + -1)

Reorder the terms:
-27 + -3a = 12(-1 + a)
-27 + -3a = (-1 * 12 + a * 12)
-27 + -3a = (-12 + 12a)

Solving
-27 + -3a = -12 + 12a

Solving for variable 'a'.

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

Add '-12a' to each side of the equation.
-27 + -3a + -12a = -12 + 12a + -12a

Combine like terms: -3a + -12a = -15a
-27 + -15a = -12 + 12a + -12a

Combine like terms: 12a + -12a = 0
-27 + -15a = -12 + 0
-27 + -15a = -12

Add '27' to each side of the equation.
-27 + 27 + -15a = -12 + 27

Combine like terms: -27 + 27 = 0
0 + -15a = -12 + 27
-15a = -12 + 27

Combine like terms: -12 + 27 = 15
-15a = 15

Divide each side by '-15'.
a = -1

Simplifying
a = -1

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