[tex]\displaystyle\bf\\2bx=-30\\\\x=5\\\\2b\cdot 5=-30\\\\10b=-30\\\\b=-30:10\\\\\boxed{b=-3}[/tex]
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[tex]\displaystyle\bf\\2bx=-30\\\\x=5\\\\2b\cdot 5=-30\\\\10b=-30\\\\b=-30:10\\\\\boxed{b=-3}[/tex]