128=a+b+c

Solution for 128=a+b+c equation:

Simplifying
128 = a + b + c

Solving
128 = a + b + c

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.
128 + -1a = a + b + -1a + c

Reorder the terms:
128 + -1a = a + -1a + b + c

Combine like terms: a + -1a = 0
128 + -1a = 0 + b + c
128 + -1a = b + c

Add '-128' to each side of the equation.
128 + -128 + -1a = b + -128 + c

Combine like terms: 128 + -128 = 0
0 + -1a = b + -128 + c
-1a = b + -128 + c

Reorder the terms:
-1a = -128 + b + c

Divide each side by '-1'.
a = 128 + -1b + -1c

Simplifying
a = 128 + -1b + -1c