Inequalities are solved just like equations except that if you
multiply an inequality through by a negative number, you must
reverse the inequality sign. But you won't have to do that with
your inequality:
Instead of doing yours for you, I'll do one exactly like yours:
Multiply through by +4 to clear the fraction.
Combine like terms:
Add 20t to both sides:
Add 36 to both sides:
Divide both sides by 21:
Now do yours using the same steps.
Yours will also come out an irreducible fraction.
Interval notation
Edwin
