-7(a-6)=91

Solution for -7(a-6)=91 equation:

Simplifying
-7(a + -6) = 91

Reorder the terms:
-7(-6 + a) = 91
(-6 * -7 + a * -7) = 91
(42 + -7a) = 91

Solving
42 + -7a = 91

Solving for variable 'a'.

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

Add '-42' to each side of the equation.
42 + -42 + -7a = 91 + -42

Combine like terms: 42 + -42 = 0
0 + -7a = 91 + -42
-7a = 91 + -42

Combine like terms: 91 + -42 = 49
-7a = 49

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

Simplifying
a = -7