15-6a=20-a

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Solution for 15-6a=20-a equation:


Simplifying
15 + -6a = 20 + -1a

Solving
15 + -6a = 20 + -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.
15 + -6a + a = 20 + -1a + a

Combine like terms: -6a + a = -5a
15 + -5a = 20 + -1a + a

Combine like terms: -1a + a = 0
15 + -5a = 20 + 0
15 + -5a = 20

Add '-15' to each side of the equation.
15 + -15 + -5a = 20 + -15

Combine like terms: 15 + -15 = 0
0 + -5a = 20 + -15
-5a = 20 + -15

Combine like terms: 20 + -15 = 5
-5a = 5

Divide each side by '-5'.
a = -1

Simplifying
a = -1

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