8-1(a+1)=9+a

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Solution for 8-1(a+1)=9+a equation:


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

Reorder the terms:
8 + -1(1 + a) = 9 + a
8 + (1 * -1 + a * -1) = 9 + a
8 + (-1 + -1a) = 9 + a

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

Solving
7 + -1a = 9 + a

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 + -1a = 9 + a + -1a

Combine like terms: -1a + -1a = -2a
7 + -2a = 9 + a + -1a

Combine like terms: a + -1a = 0
7 + -2a = 9 + 0
7 + -2a = 9

Add '-7' to each side of the equation.
7 + -7 + -2a = 9 + -7

Combine like terms: 7 + -7 = 0
0 + -2a = 9 + -7
-2a = 9 + -7

Combine like terms: 9 + -7 = 2
-2a = 2

Divide each side by '-2'.
a = -1

Simplifying
a = -1

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