Question 196249
This is pretty easy, as you will see:
:

{{{(6b+18)/b}}}
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{{{(b+3)/b}}}
In the top numerator we can factor out 6:
{{{(6(b+3))/b}}}
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{{{(b+3)/b}}}
Remember when you divide fractions: invert the dividing fraction and multiply
{{{(6(b+3))/b}}} * {{{b/(b+3)}}} = 6
You cancel out (b+3) and b