0=a*x*2+b*x+c

Solution for 0=a*x*2+b*x+c equation:

Simplifying
0 = a * x * 2 + b * x + c

Reorder the terms for easier multiplication:
0 = 2a * x + b * x + c

Multiply a * x
0 = 2ax + b * x + c

Multiply b * x
0 = 2ax + bx + c

Solving
0 = 2ax + bx + c

Solving for variable 'a'.

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

Add '-2ax' to each side of the equation.
0 + -2ax = 2ax + bx + -2ax + c
Remove the zero:
-2ax = 2ax + bx + -2ax + c

Reorder the terms:
-2ax = 2ax + -2ax + bx + c

Combine like terms: 2ax + -2ax = 0
-2ax = 0 + bx + c
-2ax = bx + c

Divide each side by '-2x'.
a = -0.5b + -0.5cx-1

Simplifying
a = -0.5b + -0.5cx-1