(643-y)*2=1512:4 и (300:х+19)*32=992

(643-у)*2=1512:4(643-у)*2=378643-у=378:2643-у=189у=643-189у=454(300:х+19)*32=992(300:х+19)=992:32300:х+19=31300:х=31-19300:х=12х=300:12х=25