a+4200=9000 7660-a=4782 X•100=88900 b-3705=5000 497+c=5300 X:100=7560 C-98=1300 147+b=5007 90000:x=3
A=9000-4200=4800 a=7660-4782=2878 x=88900:100=889 b=5000+3705=8705 с=5300-497=4803 х=7560*100=756000 с=1300+98=1398 b=5007-147=4860 x=90000:3=30000
Я-не-по-нел