[tex]\displaystyle\bf\\7x+5y-20=0\\\\x=0\\\\7\cdot 0+5y-20=0\\\\5y-20=0\\\\5y=20\\\\y=20:5\\\\\boxed{y=4}[/tex]
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[tex]\displaystyle\bf\\7x+5y-20=0\\\\x=0\\\\7\cdot 0+5y-20=0\\\\5y-20=0\\\\5y=20\\\\y=20:5\\\\\boxed{y=4}[/tex]