x+\left(\frac{x}{320}\cdot 200\cdot 0.05\right)+\left(\frac{x}{320}\cdot 120\cdot 0.19\right)=780
533464
2366654
1537169
399628
4733308
3074338
18689630
23001522
7040118
956m 48cm divide by 8
233cm divide by 1.618
make x the subject of x/13 =f
16-4²
