Уровнения 1) 3x-20=x+20 2) 7x+4=10x-5 3) 0.8y+1.4=0.4y-2.6 4) 0.6(x+7)=0.5(x-3)+6.8 5)-2(4-x)=7x+16

1)3Х-20=х+20
3х-х=20+20
2х=20
х=20\2
х=10

2) 10X - 7X = 4 + 5

3X = 9

X = 3

3) 0.8Y - 0.4Y = - 2.6 - 1.4

0,4Y = - 4

Y = - 10

4) 0.6X + 4.2 = 0.5X - 1.5 + 6.8

0.1 X = - 4.2 - 1.5 + 6,8

0.1X = 1.1

X = 11

5) - 8 + 2X = 7X + 16

5X = - 24

X = - 4.8

1) 2X = 40

X = 20