-x*2+x+20=0

Solution for -x*2+x+20=0 equation:

Simplifying
-1x * 2 + x + 20 = 0

Reorder the terms for easier multiplication:
-1 * 2x + x + 20 = 0

Multiply -1 * 2
-2x + x + 20 = 0

Reorder the terms:
20 + -2x + x = 0

Combine like terms: -2x + x = -1x
20 + -1x = 0

Solving
20 + -1x = 0

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + -1x = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -1x = 0 + -20
-1x = 0 + -20

Combine like terms: 0 + -20 = -20
-1x = -20

Divide each side by '-1'.
x = 20

Simplifying
x = 20