Solve for a
a\leq 6
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3a+4-7a\geq -20
Subtract 7a from both sides.
-4a+4\geq -20
Combine 3a and -7a to get -4a.
-4a\geq -20-4
Subtract 4 from both sides.
-4a\geq -24
Subtract 4 from -20 to get -24.
a\leq \frac{-24}{-4}
Divide both sides by -4. Since -4 is negative, the inequality direction is changed.
a\leq 6
Divide -24 by -4 to get 6.
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