6a+9=12-7(a+4)

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Solution for 6a+9=12-7(a+4) equation:


Simplifying
6a + 9 = 12 + -7(a + 4)

Reorder the terms:
9 + 6a = 12 + -7(a + 4)

Reorder the terms:
9 + 6a = 12 + -7(4 + a)
9 + 6a = 12 + (4 * -7 + a * -7)
9 + 6a = 12 + (-28 + -7a)

Combine like terms: 12 + -28 = -16
9 + 6a = -16 + -7a

Solving
9 + 6a = -16 + -7a

Solving for variable 'a'.

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

Add '7a' to each side of the equation.
9 + 6a + 7a = -16 + -7a + 7a

Combine like terms: 6a + 7a = 13a
9 + 13a = -16 + -7a + 7a

Combine like terms: -7a + 7a = 0
9 + 13a = -16 + 0
9 + 13a = -16

Add '-9' to each side of the equation.
9 + -9 + 13a = -16 + -9

Combine like terms: 9 + -9 = 0
0 + 13a = -16 + -9
13a = -16 + -9

Combine like terms: -16 + -9 = -25
13a = -25

Divide each side by '13'.
a = -1.923076923

Simplifying
a = -1.923076923

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