Math Help - How to rearrange the subject of the formula?

1. How to rearrange the subject of the formula?

could someone show me how to do these(make x the subject) feel like this atm

1. y=4/5 nx^3

2. y=mx+abx/m

3. m(2x+y)=5(2x-3)

2. Originally Posted by maths noob
1. y=4/5 nx^3
$y=\frac{4}{5}nx^3 \Rightarrow \frac{5}{4}y=nx^3 \Rightarrow \frac{5}{4n}y=x^3$

I don't know how to write it in Latex so x=cubic root of $\frac{5}{4n}y$