36х-45у-33х+3у=33х-42у=3×(11х-14у)
7×(4-3х)-(8.5-х)=4-3×(х-8)
28-21х-8.5+х=4-3х+24
-20х+3х=28-28+8.5
-17х=8.5
х=8.5÷(-17)
х=-0.5
(45-х)+18=58
45-х=58-18
45-х=40
х=45-40
х=5
-----------------
(45-5)+18=58
40=40
в=ум-р
ответ:х=5
АВ=13
С=23
.D=2
F=5 или F=85
9,45х+3,27х-1,03х+1,2=11,69х+1,2=11,69*86+1,2=1005,34+1,2=1006,54