-a+9=a+31

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Solution for -a+9=a+31 equation:


Simplifying
-1a + 9 = a + 31

Reorder the terms:
9 + -1a = a + 31

Reorder the terms:
9 + -1a = 31 + a

Solving
9 + -1a = 31 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
9 + -1a + -1a = 31 + a + -1a

Combine like terms: -1a + -1a = -2a
9 + -2a = 31 + a + -1a

Combine like terms: a + -1a = 0
9 + -2a = 31 + 0
9 + -2a = 31

Add '-9' to each side of the equation.
9 + -9 + -2a = 31 + -9

Combine like terms: 9 + -9 = 0
0 + -2a = 31 + -9
-2a = 31 + -9

Combine like terms: 31 + -9 = 22
-2a = 22

Divide each side by '-2'.
a = -11

Simplifying
a = -11

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