9a+42=12

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Solution for 9a+42=12 equation: 


Simplifying
9a + 42 = 12

Reorder the terms:
42 + 9a = 12

Solving
42 + 9a = 12

Solving for variable 'a'.

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

Add '-42' to each side of the equation.
42 + -42 + 9a = 12 + -42

Combine like terms: 42 + -42 = 0
0 + 9a = 12 + -42
9a = 12 + -42

Combine like terms: 12 + -42 = -30
9a = -30

Divide each side by '9'.
a = -3.333333333

Simplifying
a = -3.333333333

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