Extreme polynomial

Algebra Level 2

3x2+6x+7+5x2+10x+14=42xx2x= ?\large { \sqrt { 3{ { x }^{ 2 } }+6x+7 } +\sqrt { 5{ x }^{ 2 }+10x+14 } =4-2x-{ x }^{ 2 } \\ x = \ ? }

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