Question

Решите уравнения 1)-3(1+4х)=-4х-5 2)-6(-5-7х)=-8х+2 3)9+2(2х+1)=1 4)4+3(10х+7)=-5 5)4+5(-3х+7)=-9 6)5+10(-10х-9)=-3 7)-7+2(7х-2)=10

Answer 1

1
-3-12х+4х=-5
8х=-2
х=-1/4
2
30+42х+8х=2
50х=-28
х=-28/50
х=-0,56
3
9+4х+2=1
4х=-10
х=-10/4
х=-2,5
4
4+30х+21=-5
30х=-30
х=-1
5
4-15х+35=-9
-15х=-48
х=48/15
х=16/5
х=3,2
6
5-100х-90=-3
-100х=88
х=-0,88
7
-7+14х-4=10
14х=21
х=21/14
х=3/2
х=1,5

Answer 2

1)-3(1+4х)=-4х-5
-3-12х=-4х-5
-12х+4х=3-5
-8х=-2
х=-2:(-8)
х=0,25
2)-6(-5-7х)=-8х+2
30+42х=-8х+2
42х+8х=-30+2
50х=-28
х=-28:50
х=-0,56
3)9+2(2х+1)=1
9+4х+2=1
4х=1-9-2
4х=-10
х=-10:4
х=-2,5
4)4+3(10х+7)=-5
4+30х+21=-5
30х=-5-4-21
30х=-30
х=-30:30
х=-1
5)4+5(-3х+7)=-9
4-15х+35=-9
-15х=-9-4-35
-15х=-48
х=-48:(-15)
х=3,2
6)5+10(-10х-9)=-3
5-100х-90=-3
-100х=-3-5+90
-100х=82
х=82:(-100)
х=-0,82
7)-7+2(7х-2)=10
-7+14x-4=10
14x=10+7+4
14x=21
x=21:14
x=1,5