Question 943678
The mistake was to distribute the 5 factor.  This factor is only on ONE term and the left member should simple be 10x-3.


{{{5(2x)-3=20x+15}}}
{{{10x-3=-20x+15}}}
{{{10x+20x-3=15}}}
{{{30x-3=15}}}
{{{30x=18}}}
{{{x=18/30}}}
{{{highlight(x=3/5)}}}