Question 340198
First, common denominator, {{{3*8=24}}}
{{{(42/3)(8/8)=336/24}}}
{{{(5/8)(3/3)=15/24}}}
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{{{42/3-(-5/8)=336/24-(-15/24)}}}
{{{42/3-(-5/8)=336/24+15/24}}}
{{{42/3-(-5/8)=351/24)}}}
{{{42/3-(-5/8)=(117*cross(3))/(8*cross(3)))}}}
{{{42/3-(-5/8)=highlight(117/8))}}}