2a+2=a-1

Solution for 2a+2=a-1 equation:

Simplifying
2a + 2 = a + -1

Reorder the terms:
2 + 2a = a + -1

Reorder the terms:
2 + 2a = -1 + a

Solving
2 + 2a = -1 + 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.
2 + 2a + -1a = -1 + a + -1a

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

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

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

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

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

Divide each side by '1'.
a = -3

Simplifying
a = -3