Question 105322
{{{R=3-a(b+2d)}}} Start with the given equation



{{{R=3-ab-2ad}}} Distribute




{{{0=3-ab-2ad-R}}}Subtract R from both sides



{{{ab=3-2ad-R}}} Add ab to both sides



{{{b=(3-2ad-R)/a}}} Divide both sides by a


--------------------------------------------------------------

Answer:

So our answer is {{{b=(3-2ad-R)/a}}}