-8-a=-7

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Solution for -8-a=-7 equation: 


Simplifying
-8 + -1a = -7

Solving
-8 + -1a = -7

Solving for variable 'a'.

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

Add '8' to each side of the equation.
-8 + 8 + -1a = -7 + 8

Combine like terms: -8 + 8 = 0
0 + -1a = -7 + 8
-1a = -7 + 8

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

Divide each side by '-1'.
a = -1

Simplifying
a = -1

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