9-3(a+1)=4+a

Solution for 9-3(a+1)=4+a equation:

Simplifying
9 + -3(a + 1) = 4 + a

Reorder the terms:
9 + -3(1 + a) = 4 + a
9 + (1 * -3 + a * -3) = 4 + a
9 + (-3 + -3a) = 4 + a

Combine like terms: 9 + -3 = 6
6 + -3a = 4 + a

Solving
6 + -3a = 4 + 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.
6 + -3a + -1a = 4 + a + -1a

Combine like terms: -3a + -1a = -4a
6 + -4a = 4 + a + -1a

Combine like terms: a + -1a = 0
6 + -4a = 4 + 0
6 + -4a = 4

Add '-6' to each side of the equation.
6 + -6 + -4a = 4 + -6

Combine like terms: 6 + -6 = 0
0 + -4a = 4 + -6
-4a = 4 + -6

Combine like terms: 4 + -6 = -2
-4a = -2

Divide each side by '-4'.
a = 0.5

Simplifying
a = 0.5