3+square x+19-square2xwhenx=6
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3+x^2+19-2x^2
x=6
3+6^2+19-2×6^2
3+36+19-2×36
58-72
-14
x=6
3+6^2+19-2×6^2
3+36+19-2×36
58-72
-14
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