15=3(a+4)-6(a+1)

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Solution for 15=3(a+4)-6(a+1) equation:


Simplifying
15 = 3(a + 4) + -6(a + 1)

Reorder the terms:
15 = 3(4 + a) + -6(a + 1)
15 = (4 * 3 + a * 3) + -6(a + 1)
15 = (12 + 3a) + -6(a + 1)

Reorder the terms:
15 = 12 + 3a + -6(1 + a)
15 = 12 + 3a + (1 * -6 + a * -6)
15 = 12 + 3a + (-6 + -6a)

Reorder the terms:
15 = 12 + -6 + 3a + -6a

Combine like terms: 12 + -6 = 6
15 = 6 + 3a + -6a

Combine like terms: 3a + -6a = -3a
15 = 6 + -3a

Solving
15 = 6 + -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.
15 + 3a = 6 + -3a + 3a

Combine like terms: -3a + 3a = 0
15 + 3a = 6 + 0
15 + 3a = 6

Add '-15' to each side of the equation.
15 + -15 + 3a = 6 + -15

Combine like terms: 15 + -15 = 0
0 + 3a = 6 + -15
3a = 6 + -15

Combine like terms: 6 + -15 = -9
3a = -9

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

Simplifying
a = -3

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