81=-7-4(6+4a)

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Solution for 81=-7-4(6+4a) equation: 


Simplifying
81 = -7 + -4(6 + 4a)
81 = -7 + (6 * -4 + 4a * -4)
81 = -7 + (-24 + -16a)

Combine like terms: -7 + -24 = -31
81 = -31 + -16a

Solving
81 = -31 + -16a

Solving for variable 'a'.

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

Add '16a' to each side of the equation.
81 + 16a = -31 + -16a + 16a

Combine like terms: -16a + 16a = 0
81 + 16a = -31 + 0
81 + 16a = -31

Add '-81' to each side of the equation.
81 + -81 + 16a = -31 + -81

Combine like terms: 81 + -81 = 0
0 + 16a = -31 + -81
16a = -31 + -81

Combine like terms: -31 + -81 = -112
16a = -112

Divide each side by '16'.
a = -7

Simplifying
a = -7

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