Question 592882
{{{(x^2+3x+4)-(x^2-2x)}}}


{{{x^2+3x+4-x^2+2x}}}


{{{(x^2-x^2)+(3x+2x)+4}}}


{{{5x+4}}}



So {{{(x^2+3x+4)-(x^2-2x)=5x+4}}} for all values of x.

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