Question

how do i solve

Answer 1

\[3f+9<21\]

Answer 2

If I subtract \(9\) from both sides, I can write this:
\(3f+9-9<21-9\)
please simplify

Answer 3

so i subtract the 9 from 9 and 12

Answer 4

\[3f<12\]

Answer 5

@Michele_Laino

Answer 6

ok! now i divide both sides by \(3\), so I get:
\[\frac{{3f}}{3} < \frac{{12}}{3}\]
please, simplify again

Answer 7

\[f<4\]

Answer 8

right

Answer 9

correct!

Answer 10

ty