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Simplifying
23 = x2 + 7
Reorder the terms:
23 = 7 + x2
Solving
23 = 7 + 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.
23 + -1x2 = 7 + x2 + -1x2
Combine like terms: x2 + -1x2 = 0
23 + -1x2 = 7 + 0
23 + -1x2 = 7
Add '-23' to each side of the equation.
23 + -23 + -1x2 = 7 + -23
Combine like terms: 23 + -23 = 0
0 + -1x2 = 7 + -23
-1x2 = 7 + -23
Combine like terms: 7 + -23 = -16
-1x2 = -16
Divide each side by '-1'.
x2 = 16
Simplifying
x2 = 16
Take the square root of each side:
x = {-4, 4}
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