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The expression is given as,
[tex]-3+7x^2-4x-5+3x^2-2x[/tex]Rearranging the like terms,
[tex]7x^2+3x^2-4x-2x-5-3[/tex]Like terms : Terms that have same power of variable.
Simplifying further,
[tex]10x^2-6x-8[/tex]Thus the result of the given expression is,
[tex]10x^2-6x-8[/tex]