Question 964848
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This problem is ambiguous: if the following equation is not correct,
re-post the problem and try to be more specific. 
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{{{6n/10-(2n+3)/5=20}}}
{{{6n/10-((2n+3)/5)(2/2)=20}}}
{{{6n/10-(4n+6)/10=20}}}
{{{(6n-4n-6)/10=20}}}
{{{2n-6=200}}}
{{{2n=206}}}
{{{n=103}}}
CHECK:
{{{6n/10-(2n+3)/5=20}}}
{{{6(103)/10-(2(103)+3)/5=20}}}
{{{618/10-(206+3)/5=20}}}
{{{618/10-209/5=20}}}
{{{618/10-418/10=20
{{{200/10=20}}}
{{{20=20}}}