(3a)=12+(a+3)

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Solution for (3a)=12+(a+3) equation:


Simplifying
(3a) = 12 + (a + 3)

Reorder the terms:
(3a) = 12 + (3 + a)

Remove parenthesis around (3 + a)
(3a) = 12 + 3 + a

Combine like terms: 12 + 3 = 15
(3a) = 15 + a

Solving
(3a) = 15 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
(3a) + -1a = 15 + a + -1a

Combine like terms: (3a) + -1a = 2a
2a = 15 + a + -1a

Combine like terms: a + -1a = 0
2a = 15 + 0
2a = 15

Divide each side by '2'.
a = 7.5

Simplifying
a = 7.5

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