Algebra
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Substitute into algebraic expressions IV

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Evaluate $2v$2v when $v=-3$v=3.

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Find the value of $\frac{r}{5}$r5 when $r=-20$r=20.

Evaluate $\frac{5c}{2}$5c2 when $c=-4$c=4.

Evaluate $\frac{15}{r}$15r when $r=-3$r=3.

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