Solve the systems in Problems 15-26 by the substitution method. (left{begin{array}{l}x+y=12 0.6 y=0.5(12)end{array}ight.)
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Solve the systems in Problems 15-26 by the substitution method.
\(\left\{\begin{array}{l}x+y=12 \\ 0.6 y=0.5(12)\end{array}ight.\)
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