31=13-2a

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Solution for 31=13-2a equation:


Simplifying
31 = 13 + -2a

Solving
31 = 13 + -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
31 + 2a = 13 + -2a + 2a

Combine like terms: -2a + 2a = 0
31 + 2a = 13 + 0
31 + 2a = 13

Add '-31' to each side of the equation.
31 + -31 + 2a = 13 + -31

Combine like terms: 31 + -31 = 0
0 + 2a = 13 + -31
2a = 13 + -31

Combine like terms: 13 + -31 = -18
2a = -18

Divide each side by '2'.
a = -9

Simplifying
a = -9

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