20-21=21-21+13a

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Solution for 20-21=21-21+13a equation:


Simplifying
20 + -21 = 21 + -21 + 13a

Combine like terms: 20 + -21 = -1
-1 = 21 + -21 + 13a

Combine like terms: 21 + -21 = 0
-1 = 0 + 13a
-1 = 13a

Solving
-1 = 13a

Solving for variable 'a'.

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

Add '-13a' to each side of the equation.
-1 + -13a = 13a + -13a

Combine like terms: 13a + -13a = 0
-1 + -13a = 0

Add '1' to each side of the equation.
-1 + 1 + -13a = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -13a = 0 + 1
-13a = 0 + 1

Combine like terms: 0 + 1 = 1
-13a = 1

Divide each side by '-13'.
a = -0.07692307692

Simplifying
a = -0.07692307692

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