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Simplifying
120 = x2 + 20
Reorder the terms:
120 = 20 + x2
Solving
120 = 20 + x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-1x2' to each side of the equation.
120 + -1x2 = 20 + x2 + -1x2
Combine like terms: x2 + -1x2 = 0
120 + -1x2 = 20 + 0
120 + -1x2 = 20
Add '-120' to each side of the equation.
120 + -120 + -1x2 = 20 + -120
Combine like terms: 120 + -120 = 0
0 + -1x2 = 20 + -120
-1x2 = 20 + -120
Combine like terms: 20 + -120 = -100
-1x2 = -100
Divide each side by '-1'.
x2 = 100
Simplifying
x2 = 100
Take the square root of each side:
x = {-10, 10}
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