150*Х*3=1800,12090-Х=3090:30,а:30=768+987,(Х+240)*3-360=540,876+у+9869=78000

150*х*3=1800450х=1800х=1800:450х=412090-х=3090:3012090-х=103х=12090-103х=11987а:30=768+987а:30=1755а=1755*30а=52650(х+240)*3-360=540(х+240)*3=540+360(х+240)*3=900х+240=900:3х+240=300х=300-240х=60876+у+9869=7800010745+у=78000у=78000-10745у=67255