-7=8-(9-a)

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Solution for -7=8-(9-a) equation:


Simplifying
-7 = 8 + -1(9 + -1a)
-7 = 8 + (9 * -1 + -1a * -1)
-7 = 8 + (-9 + 1a)

Combine like terms: 8 + -9 = -1
-7 = -1 + 1a

Solving
-7 = -1 + 1a

Solving for variable 'a'.

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

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

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

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

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

Combine like terms: -1 + 7 = 6
-1a = 6

Divide each side by '-1'.
a = -6

Simplifying
a = -6

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