3-9=4a+12

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Solution for 3-9=4a+12 equation:


Simplifying
3 + -9 = 4a + 12

Combine like terms: 3 + -9 = -6
-6 = 4a + 12

Reorder the terms:
-6 = 12 + 4a

Solving
-6 = 12 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
-6 + -4a = 12 + 4a + -4a

Combine like terms: 4a + -4a = 0
-6 + -4a = 12 + 0
-6 + -4a = 12

Add '6' to each side of the equation.
-6 + 6 + -4a = 12 + 6

Combine like terms: -6 + 6 = 0
0 + -4a = 12 + 6
-4a = 12 + 6

Combine like terms: 12 + 6 = 18
-4a = 18

Divide each side by '-4'.
a = -4.5

Simplifying
a = -4.5

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