Question 60690
When you have a problem such as 3y-7y=28, how would you simplify the problem? Would it be -4y=28? 
You've done the first step, you can now divide both sides of the = sign by -4.
{{{-4y/-4=28/-4}}}
{{{1y=-7}}}
{{{highlight(y=-7)}}}
:
Check, do both sides = if y=-7?
3(-7)-7(-7)=28 ?
-21+49=28 ? 
28=28  We're right!!!
Happy Calculating!!!