4(a+3)=9[a-(7-a)]

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Solution for 4(a+3)=9[a-(7-a)] equation:


Simplifying
4(a + 3) = 9[a + -1(7 + -1a)]

Reorder the terms:
4(3 + a) = 9[a + -1(7 + -1a)]
(3 * 4 + a * 4) = 9[a + -1(7 + -1a)]
(12 + 4a) = 9[a + -1(7 + -1a)]
12 + 4a = 9[a + (7 * -1 + -1a * -1)]
12 + 4a = 9[a + (-7 + 1a)]

Reorder the terms:
12 + 4a = 9[-7 + a + 1a]

Combine like terms: a + 1a = 2a
12 + 4a = 9[-7 + 2a]
12 + 4a = [-7 * 9 + 2a * 9]
12 + 4a = [-63 + 18a]

Solving
12 + 4a = -63 + 18a

Solving for variable 'a'.

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

Add '-18a' to each side of the equation.
12 + 4a + -18a = -63 + 18a + -18a

Combine like terms: 4a + -18a = -14a
12 + -14a = -63 + 18a + -18a

Combine like terms: 18a + -18a = 0
12 + -14a = -63 + 0
12 + -14a = -63

Add '-12' to each side of the equation.
12 + -12 + -14a = -63 + -12

Combine like terms: 12 + -12 = 0
0 + -14a = -63 + -12
-14a = -63 + -12

Combine like terms: -63 + -12 = -75
-14a = -75

Divide each side by '-14'.
a = 5.357142857

Simplifying
a = 5.357142857

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