Question

what is |3/4a-3|=9

Answer 1

you can get rid of the absolute value by squaring both sides:
\[\left| \frac{ 3 }{ 4 }a-3 \right|=9\]
\[\rightarrow (\frac{ 3 }{ 4 }a-3)^2=81\]

Answer 2

Thank you so much