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OpenStudy (anonymous):
{(x, f(x)):f(x)=2x+3}, evaluate if f(3)
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OpenStudy (xapproachesinfinity):
Just replace x with 3 \(\LARGE \tt\color{midnightblue}{f(\color {red}{x})=2\color{red}{x}+3\\f(\color{red}3)=2(\color{red}{3})+3}\)
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