[tex]\displaystyle\bf\\b-0,2\cdot(b-3)=5b\\\\b-0,2\cdot b-0,2\cdot (-3)=5b\\\\b-0,2b+0,6=5b\\\\0,8b-5b=-0,6\\\\-4,2b=-0,6\\\\b=-0,6:(-4,2)\\\\\boxed{b=\frac{1}{7} }[/tex]
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[tex]\displaystyle\bf\\b-0,2\cdot(b-3)=5b\\\\b-0,2\cdot b-0,2\cdot (-3)=5b\\\\b-0,2b+0,6=5b\\\\0,8b-5b=-0,6\\\\-4,2b=-0,6\\\\b=-0,6:(-4,2)\\\\\boxed{b=\frac{1}{7} }[/tex]