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Simplifying
16x2 + -25 = 231
Reorder the terms:
-25 + 16x2 = 231
Solving
-25 + 16x2 = 231
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '25' to each side of the equation.
-25 + 25 + 16x2 = 231 + 25
Combine like terms: -25 + 25 = 0
0 + 16x2 = 231 + 25
16x2 = 231 + 25
Combine like terms: 231 + 25 = 256
16x2 = 256
Divide each side by '16'.
x2 = 16
Simplifying
x2 = 16
Take the square root of each side:
x = {-4, 4}
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