20-2a=31

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Solution for 20-2a=31 equation: 


Simplifying
20 + -2a = 31

Solving
20 + -2a = 31

Solving for variable 'a'.

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

Add '-20' to each side of the equation.
20 + -20 + -2a = 31 + -20

Combine like terms: 20 + -20 = 0
0 + -2a = 31 + -20
-2a = 31 + -20

Combine like terms: 31 + -20 = 11
-2a = 11

Divide each side by '-2'.
a = -5.5

Simplifying
a = -5.5

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