8+х/7 = 3х-5/6,5
6,5 * (8 + х) = 7 * (3х - 5)
52 + 6,5х = 21х - 35
6,5х - 21х = -52 - 35
-14,5х = -87
14,5х = 87
х = 87 : 14,5
х = 6
2750 * 2040 / 550 * 203 + 27583 – (9842 – 8179) * 212 = 1745627
<span> 1) 9842 - 8179 = 1663
</span> 2) 2750 * 2040 = 5610000
3) 5610000 / 550 = 10200
4) 10200 * 203 = 2070600
5) 1663 * 212 = 352556
6) 2070600 + 27583 = 2098183
<span>
7) 2098183 - 352556 = 1745627</span>
7-2x =1\5x. 35-10x=x
7=1\5x+2x. 35=x+10x
7=11/5x. 35=11x
x=11/35. x=11/35
-3/7а+5/6а-8/21а=-1/49
-18/42а+35/42а-16/42а=-1/49
1/42а=-1/49
а=-1/49:1/42
а=-6/7