2s-7-a=-9+3

Solution for 2s-7-a=-9+3 equation:

Simplifying
2s + -7 + -1a = -9 + 3

Reorder the terms:
-7 + -1a + 2s = -9 + 3

Combine like terms: -9 + 3 = -6
-7 + -1a + 2s = -6

Solving
-7 + -1a + 2s = -6

Solving for variable 'a'.

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

Add '7' to each side of the equation.
-7 + -1a + 7 + 2s = -6 + 7

Reorder the terms:
-7 + 7 + -1a + 2s = -6 + 7

Combine like terms: -7 + 7 = 0
0 + -1a + 2s = -6 + 7
-1a + 2s = -6 + 7

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

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

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

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

Simplifying
a = -1 + 2s