-18=-3(a+3)+12

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Solution for -18=-3(a+3)+12 equation:


Simplifying
-18 = -3(a + 3) + 12

Reorder the terms:
-18 = -3(3 + a) + 12
-18 = (3 * -3 + a * -3) + 12
-18 = (-9 + -3a) + 12

Reorder the terms:
-18 = -9 + 12 + -3a

Combine like terms: -9 + 12 = 3
-18 = 3 + -3a

Solving
-18 = 3 + -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.
-18 + 3a = 3 + -3a + 3a

Combine like terms: -3a + 3a = 0
-18 + 3a = 3 + 0
-18 + 3a = 3

Add '18' to each side of the equation.
-18 + 18 + 3a = 3 + 18

Combine like terms: -18 + 18 = 0
0 + 3a = 3 + 18
3a = 3 + 18

Combine like terms: 3 + 18 = 21
3a = 21

Divide each side by '3'.
a = 7

Simplifying
a = 7

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