Solve for m
m\geq 80
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20+0.8m-0.7m\geq 28
Subtract 0.7m from both sides.
20+0.1m\geq 28
Combine 0.8m and -0.7m to get 0.1m.
0.1m\geq 28-20
Subtract 20 from both sides.
0.1m\geq 8
Subtract 20 from 28 to get 8.
m\geq \frac{8}{0.1}
Divide both sides by 0.1. Since 0.1 is positive, the inequality direction remains the same.
m\geq 80
Expand \frac{8}{0.1} by multiplying both numerator and the denominator by 10. Anything divided by one gives itself.
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