-3[2a+7]=3a+12

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Solution for -3[2a+7]=3a+12 equation:


Simplifying
-3[2a + 7] = 3a + 12

Reorder the terms:
-3[7 + 2a] = 3a + 12
[7 * -3 + 2a * -3] = 3a + 12
[-21 + -6a] = 3a + 12

Reorder the terms:
-21 + -6a = 12 + 3a

Solving
-21 + -6a = 12 + 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.
-21 + -6a + -3a = 12 + 3a + -3a

Combine like terms: -6a + -3a = -9a
-21 + -9a = 12 + 3a + -3a

Combine like terms: 3a + -3a = 0
-21 + -9a = 12 + 0
-21 + -9a = 12

Add '21' to each side of the equation.
-21 + 21 + -9a = 12 + 21

Combine like terms: -21 + 21 = 0
0 + -9a = 12 + 21
-9a = 12 + 21

Combine like terms: 12 + 21 = 33
-9a = 33

Divide each side by '-9'.
a = -3.666666667

Simplifying
a = -3.666666667

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