1+(-a)=-6+a

Solution for 1+(-a)=-6+a equation:

Simplifying
1 + (-1a) = -6 + a

Solving
1 + (-1a) = -6 + 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.
1 + (-1a) + -1a = -6 + a + -1a

Combine like terms: (-1a) + -1a = -2a
1 + -2a = -6 + a + -1a

Combine like terms: a + -1a = 0
1 + -2a = -6 + 0
1 + -2a = -6

Add '-1' to each side of the equation.
1 + -1 + -2a = -6 + -1

Combine like terms: 1 + -1 = 0
0 + -2a = -6 + -1
-2a = -6 + -1

Combine like terms: -6 + -1 = -7
-2a = -7

Divide each side by '-2'.
a = 3.5

Simplifying
a = 3.5