81=8a-1a

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Solution for 81=8a-1a equation:


Simplifying
81 = 8a + -1a

Combine like terms: 8a + -1a = 7a
81 = 7a

Solving
81 = 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
81 + -7a = 7a + -7a

Combine like terms: 7a + -7a = 0
81 + -7a = 0

Add '-81' to each side of the equation.
81 + -81 + -7a = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -7a = 0 + -81
-7a = 0 + -81

Combine like terms: 0 + -81 = -81
-7a = -81

Divide each side by '-7'.
a = 11.57142857

Simplifying
a = 11.57142857

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