Question 183635
To solve you want the total dollars spent in each transaction to be equal
{{{$6x=$3x+$30}}}
Moving all x variables to one side gets
{{{6x-3x=30}}}
Simplify
{{{3x=30}}}
Divide both sides by 3
{{{3x/3=30/3}}}
Reduce
{{{x=10}}}

Check answer by putting the result in first eqution
{{{6*(10)=3*(10)+30}}}
Simplify
{{{60=30+30}}}
{{{60=60}}}
Solution works!