3(a+7)=4[a-(6-a)]

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Solution for 3(a+7)=4[a-(6-a)] equation:


Simplifying
3(a + 7) = 4[a + -1(6 + -1a)]

Reorder the terms:
3(7 + a) = 4[a + -1(6 + -1a)]
(7 * 3 + a * 3) = 4[a + -1(6 + -1a)]
(21 + 3a) = 4[a + -1(6 + -1a)]
21 + 3a = 4[a + (6 * -1 + -1a * -1)]
21 + 3a = 4[a + (-6 + 1a)]

Reorder the terms:
21 + 3a = 4[-6 + a + 1a]

Combine like terms: a + 1a = 2a
21 + 3a = 4[-6 + 2a]
21 + 3a = [-6 * 4 + 2a * 4]
21 + 3a = [-24 + 8a]

Solving
21 + 3a = -24 + 8a

Solving for variable 'a'.

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

Add '-8a' to each side of the equation.
21 + 3a + -8a = -24 + 8a + -8a

Combine like terms: 3a + -8a = -5a
21 + -5a = -24 + 8a + -8a

Combine like terms: 8a + -8a = 0
21 + -5a = -24 + 0
21 + -5a = -24

Add '-21' to each side of the equation.
21 + -21 + -5a = -24 + -21

Combine like terms: 21 + -21 = 0
0 + -5a = -24 + -21
-5a = -24 + -21

Combine like terms: -24 + -21 = -45
-5a = -45

Divide each side by '-5'.
a = 9

Simplifying
a = 9

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