Question 371127
How would you solve it if it was 
{{{300+10x=20x-600}}}??
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The rules are all the same except for one rule. 
If you multiply or divide by a negative value, change the direction of the inequality.
I'll do the first one, you do the next.
{{{300+10x>=20x-600}}}
{{{300+10x-20x>=-600}}}<--- Subtract 20x from both sides
{{{300-10x>=-600}}}
{{{-10x>=-600-300}}}<--- Subtract 300 from both sides.
{{{-10x>=-900}}}
{{{highlight(x<=90)}}}<--- Divide by -10, Change the direction of the inequality