Solve for x
x<300
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20x+3000-30x>0
Subtract 30x from both sides.
-10x+3000>0
Combine 20x and -30x to get -10x.
-10x>-3000
Subtract 3000 from both sides. Anything subtracted from zero gives its negation.
x<\frac{-3000}{-10}
Divide both sides by -10. Since -10 is negative, the inequality direction is changed.
x<300
Divide -3000 by -10 to get 300.
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