9-4a=13

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Solution for 9-4a=13 equation: 


Simplifying
9 + -4a = 13

Solving
9 + -4a = 13

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + -4a = 13 + -9

Combine like terms: 9 + -9 = 0
0 + -4a = 13 + -9
-4a = 13 + -9

Combine like terms: 13 + -9 = 4
-4a = 4

Divide each side by '-4'.
a = -1

Simplifying
a = -1

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