46целых 4 5пятых:(12,6-4х)=30

234/4:(63/5-4x)=30

234/5:63-20x/5=30

234/5*5/63-20x=30

234*1/63-20x=30

234/63-20x=30

234=30 (63-20x)

234=1890-600x

600x=1890-234

600x=1656

x=69/25=2 19/25 =(2,76)