18-6=4a-(a-3)

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Solution for 18-6=4a-(a-3) equation:


Simplifying
18 + -6 = 4a + -1(a + -3)

Combine like terms: 18 + -6 = 12
12 = 4a + -1(a + -3)

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

Reorder the terms:
12 = 3 + 4a + -1a

Combine like terms: 4a + -1a = 3a
12 = 3 + 3a

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

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

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

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

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

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

Simplifying
a = 3

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