-x^2=-2x^2+16

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Solution for -x^2=-2x^2+16 equation: 


Simplifying
-1x2 = -2x2 + 16

Reorder the terms:
-1x2 = 16 + -2x2

Solving
-1x2 = 16 + -2x2

Solving for variable 'x'.

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

Add '2x2' to each side of the equation.
-1x2 + 2x2 = 16 + -2x2 + 2x2

Combine like terms: -1x2 + 2x2 = 1x2
1x2 = 16 + -2x2 + 2x2

Combine like terms: -2x2 + 2x2 = 0
1x2 = 16 + 0
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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