4(3-a)-(6a+9)=-12a

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Solution for 4(3-a)-(6a+9)=-12a equation:


Simplifying
4(3 + -1a) + -1(6a + 9) = -12a
(3 * 4 + -1a * 4) + -1(6a + 9) = -12a
(12 + -4a) + -1(6a + 9) = -12a

Reorder the terms:
12 + -4a + -1(9 + 6a) = -12a
12 + -4a + (9 * -1 + 6a * -1) = -12a
12 + -4a + (-9 + -6a) = -12a

Reorder the terms:
12 + -9 + -4a + -6a = -12a

Combine like terms: 12 + -9 = 3
3 + -4a + -6a = -12a

Combine like terms: -4a + -6a = -10a
3 + -10a = -12a

Solving
3 + -10a = -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.
3 + -10a + 12a = -12a + 12a

Combine like terms: -10a + 12a = 2a
3 + 2a = -12a + 12a

Combine like terms: -12a + 12a = 0
3 + 2a = 0

Add '-3' to each side of the equation.
3 + -3 + 2a = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 2a = 0 + -3
2a = 0 + -3

Combine like terms: 0 + -3 = -3
2a = -3

Divide each side by '2'.
a = -1.5

Simplifying
a = -1.5

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