[tex]\displaystyle\bf\\5)\\\\2x+5y=20\\\\2x=20-5y \ |: 2\\\\\boxed{x=10-2,5y}[/tex]
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[tex]\displaystyle\bf\\5)\\\\2x+5y=20\\\\2x=20-5y \ |: 2\\\\\boxed{x=10-2,5y}[/tex]