31=4a-9

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Solution for 31=4a-9 equation:


Simplifying
31 = 4a + -9

Reorder the terms:
31 = -9 + 4a

Solving
31 = -9 + 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.
31 + -4a = -9 + 4a + -4a

Combine like terms: 4a + -4a = 0
31 + -4a = -9 + 0
31 + -4a = -9

Add '-31' to each side of the equation.
31 + -31 + -4a = -9 + -31

Combine like terms: 31 + -31 = 0
0 + -4a = -9 + -31
-4a = -9 + -31

Combine like terms: -9 + -31 = -40
-4a = -40

Divide each side by '-4'.
a = 10

Simplifying
a = 10

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