2x^2-25=x^2
2x^2-x^2=25
x^2=25
x=+-5, x=5.
2x^2-81=x^2
x^2=81
x=+-9, x=9
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2x^2-25=x^2
2x^2-x^2=25
x^2=25
x=+-5, x=5.
2x^2-81=x^2
x^2=81
x=+-9, x=9