How Do You Calculate Object Height in Lens Imaging?

[CuteWolf]

The image distance is 144cm, the object distance is 36cm, and the image height is -96cm. I need to find the object's height.

h_i / h_o = -d_i / d_o

-96 / h_o = -144 / 36

But now I am unsure of how to bring the -96 over to the other side to have the object's height isolated. Please help?

 

[VanOosten]

(-96/ho)*ho=(-144/36)*ho
-96=-144ho/36
there is your first step,
now use the same idea either multiplying or dividing both sides of the equation by the same thing to get ho by itself