-9(6+8a)=31

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Solution for -9(6+8a)=31 equation: 


Simplifying
-9(6 + 8a) = 31
(6 * -9 + 8a * -9) = 31
(-54 + -72a) = 31

Solving
-54 + -72a = 31

Solving for variable 'a'.

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

Add '54' to each side of the equation.
-54 + 54 + -72a = 31 + 54

Combine like terms: -54 + 54 = 0
0 + -72a = 31 + 54
-72a = 31 + 54

Combine like terms: 31 + 54 = 85
-72a = 85

Divide each side by '-72'.
a = -1.180555556

Simplifying
a = -1.180555556

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