a-2(a+1)=3

Solution for a-2(a+1)=3 equation:

Simplifying
a + -2(a + 1) = 3

Reorder the terms:
a + -2(1 + a) = 3
a + (1 * -2 + a * -2) = 3
a + (-2 + -2a) = 3

Reorder the terms:
-2 + a + -2a = 3

Combine like terms: a + -2a = -1a
-2 + -1a = 3

Solving
-2 + -1a = 3

Solving for variable 'a'.

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

Add '2' to each side of the equation.
-2 + 2 + -1a = 3 + 2

Combine like terms: -2 + 2 = 0
0 + -1a = 3 + 2
-1a = 3 + 2

Combine like terms: 3 + 2 = 5
-1a = 5

Divide each side by '-1'.
a = -5

Simplifying
a = -5