tolong bantu ngerjain soalnya nya pake cara

[tex] \frac{30}{36} [/tex] =[tex] \frac{45-x}{48} [/tex] 
40 = 45-x
x= 45-40
 = 5
45-5= 40
36x48=1728
40x30=1200
1728-1200=528 c