Question 306390
31x=62(x+3)
My work: 31x=62x+186
divide 31 from both sides
x=2x+6 <---- YOU'RE GOOD UP TO HERE.

You need to get all the x terms on the left, everything else on the right. 
Subtract 2x from both sides. 
Go from there and re-post if you get stuck.

Also, you can always check your answer with the original equation.
{{{ x=3}}}
{{{31(3)=62(3+3)}}}
{{{93=366}}}
Nope that's not the right answer.