19=20-7a-a

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Solution for 19=20-7a-a equation:


Simplifying
19 = 20 + -7a + -1a

Combine like terms: -7a + -1a = -8a
19 = 20 + -8a

Solving
19 = 20 + -8a

Solving for variable 'a'.

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

Add '8a' to each side of the equation.
19 + 8a = 20 + -8a + 8a

Combine like terms: -8a + 8a = 0
19 + 8a = 20 + 0
19 + 8a = 20

Add '-19' to each side of the equation.
19 + -19 + 8a = 20 + -19

Combine like terms: 19 + -19 = 0
0 + 8a = 20 + -19
8a = 20 + -19

Combine like terms: 20 + -19 = 1
8a = 1

Divide each side by '8'.
a = 0.125

Simplifying
a = 0.125

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