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Isolate the x term onto one side of the equation, divide both sides by the constant of the x term, and take the square root of both sides.
 
2x2 - 3 = 15
2x= 18
x2 = 9 
x = 3 or x = -3
 
Note that the square root of 9 is 3 or -3, both are solutions.
(-3)2 = -3*-3= 9 

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