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Simplifying
20 + -1x2 = 18
Solving
20 + -1x2 = 18
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 + -1x2 = 18 + -20
Combine like terms: 20 + -20 = 0
0 + -1x2 = 18 + -20
-1x2 = 18 + -20
Combine like terms: 18 + -20 = -2
-1x2 = -2
Divide each side by '-1'.
x2 = 2
Simplifying
x2 = 2
Take the square root of each side:
x = {-1.414213562, 1.414213562}
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