Evaluate (complex solution)
v_{10}=4ad\nu _{s}\text{ and }4ad\nu _{s}=21
Solve for ν_s
\nu _{s}=\frac{21}{4ad}
v_{10}=21\text{ and }a\neq 0\text{ and }d\neq 0
Solve for v_10
v_{10}=21
d\neq 0\text{ and }a\neq 0\text{ and }\nu _{s}=\frac{21}{4ad}
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