Solve the systems in Problems 15-26 by the substitution method. (left{begin{array}{l}x=3 y-4 5 x-4 y=-9end{array}ight.)
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Solve the systems in Problems 15-26 by the substitution method.
\(\left\{\begin{array}{l}x=3 y-4 \\ 5 x-4 y=-9\end{array}ight.\)
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