1)

Ответ:

Пошаговое объяснение:

1)

-30+2x+1=5(7-x)

-30 + 2x + 1 = 35 - 5x

-29 + 2x = 35 - 5x

2x + 5x = 35 + 29

7x = 64

x = 9 1/7

2)

-3(n+1)+2=3-2(n+5)

-3n - 3 + 2 = 3 - 2n - 10

-3n - 1 = -2n - 7

-3n + 2n = -7 + 1

-n = -6

n = 6

3)

-5(y-3)=7-2(3-y)

-5y + 15 = 7 - 6 + 2y

-5y + 15 = 1 + 2y

2y+ 5y = 15 - 1

7y = 14

y = 14 : 7

y = 2

4)

1/2(2-3x)=0,4-0,1x+3

1 - 3/2x = 0,4 - 0,1x + 3

1 - 1,5x = 3,4 - 0,1x

-1,5x + 0,1x = 3,4 - 1

-1,4x = 2,4

x = 2,4 : (-1,4)

x = -1 5/7

5)

3/5x+1/3-2x=1/5(3x-5)

-1 2/5x + 1/3 = 3/5x - 1

-1 2/5x - 3/5 = -1 - 1/3

-2x = -1 1/3

x = -1 1/3 : (-2)

x = -4/3 * (-1/2)

x = 2/3