18-6a=4A-4[a+3]

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Solution for 18-6a=4A-4[a+3] equation:


Simplifying
18 + -6a = 4A + -4[a + 3]

Reorder the terms:
18 + -6a = 4A + -4[3 + a]
18 + -6a = 4A + [3 * -4 + a * -4]
18 + -6a = 4A + [-12 + -4a]

Reorder the terms:
18 + -6a = -12 + 4A + -4a

Solving
18 + -6a = -12 + 4A + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
18 + -6a + 4a = -12 + 4A + -4a + 4a

Combine like terms: -6a + 4a = -2a
18 + -2a = -12 + 4A + -4a + 4a

Combine like terms: -4a + 4a = 0
18 + -2a = -12 + 4A + 0
18 + -2a = -12 + 4A

Add '-18' to each side of the equation.
18 + -18 + -2a = -12 + -18 + 4A

Combine like terms: 18 + -18 = 0
0 + -2a = -12 + -18 + 4A
-2a = -12 + -18 + 4A

Combine like terms: -12 + -18 = -30
-2a = -30 + 4A

Divide each side by '-2'.
a = 15 + -2A

Simplifying
a = 15 + -2A

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