Question 110167
Actually you have a sign error in the 2nd step.
:
Try it this way:
{{{15-(-3)(2x-9)=60}}}
:
{{{15-((-6x)+27)=60}}} :note the extra set of parentheses.
{{{15-27+6x=60}}}
{{{-12+6x=60}}}  : collect terms
{{{6x=72}}}      : add 12 to both sides
{{{x=12}}}       : divide by 6
:
Check your answer:
:
{{{15-(-3)(2(12)-9)=60}}}
{{{15-(-3)(24-9)=60}}}
{{{15-(-3)(15)=60}}}
{{{15-(-45)=60}}}
{{{15+45=60}}}
:
Hope that helps