2x^2-c=15

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Solution for 2x^2-c=15 equation: 


Simplifying
2x2 + -1c = 15

Reorder the terms:
-1c + 2x2 = 15

Solving
-1c + 2x2 = 15

Solving for variable 'c'.

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

Add '-2x2' to each side of the equation.
-1c + 2x2 + -2x2 = 15 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-1c + 0 = 15 + -2x2
-1c = 15 + -2x2

Divide each side by '-1'.
c = -15 + 2x2

Simplifying
c = -15 + 2x2

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