1) 4х-6+10х=11х+12
14х-11х=12+6
3х=18
Х=18/3
Х=6
2) 8+4(х-2)=-10-х
8+4х-8=-10-х
5х=-10
Х=-2
3) 2(5-2х)-(х+1)=-6
10-4х-х-1=-6
-5х=-15
Х=3
4) 3-7х=-5(х+3)
3-7х=-5х-15
-2х=-18
Х=9
A) x +6/18 = 16/18 =>
x = 16/18 - 6/18 = (16-6)/18 = 10/18
б) 13/25 -(y+6/25) = 4/25 =>
(y + 6/25) = 13/25 - 4/25 = 9/25 =>
y = 9/25 - 6/25 = (9-6)/25 = 3/25
400x800=320000,120x700=84000 44207x9=397863 320000-84000+397863=633863
20000/40=40*5=200и ставишь два ноля после пяти