18-20=-1a

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Solution for 18-20=-1a equation:


Simplifying
18 + -20 = -1a

Combine like terms: 18 + -20 = -2
-2 = -1a

Solving
-2 = -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
-2 + a = -1a + a

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

Add '2' to each side of the equation.
-2 + 2 + a = 0 + 2

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

Combine like terms: 0 + 2 = 2
a = 2

Simplifying
a = 2

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