Пошаговое объяснение:

1)

4 * (7х - 15) = 24

28х - 60 = 24

28х = 24 + 60

28х = 84

х = 84 : 28

х = 3

2)

9х - 11 = 25 + 3х

9х - 3х = 25 + 11

6х = 36

х = 36 : 6

х = 6

3)

3у + 5*(у - 4) = 58 - 5у

3у + 5у - 20 = 58 - 5у

8у - 20 = 58 - 5у

8у + 5у = 58 + 20

13у = 78

у = 78 : 13

у = 6

4)

5*(9 - 5х) + 7*(2 + 3х) = 55

45 - 25х + 14 + 21х = 55

-4х + 59 = 55

-4х = 55 - 59

-4х = -4

х = -4 : (-4)

х = 1

5)

9х + 2*(18 - 4х) = 10 + 3*(3х - 2)

9х + 36 - 8х = 10 + 9х - 6

х + 36 = 9х + 4

х - 9х = 4 - 36

-8х = -32

х = -32 : (-8)

х = 4

Ответ:

[tex]4(7x - 15) = 24 \\ 28x - 60 = 24 \\ 28x = 24 + 60 \\ 28x = 84 \\ x = 84 \div 28 \\ x = 3[/tex]

9х-11=25+3х

9х-3х=25+11

6х=36

х=6

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3у+5(у-4)=58-5у

3у+5у-20=58-5у

8у-20=58-5у

8у+5у=58+20

13у=78

у=6

______

5×(9-5х)+7(2+3х)=55

45-25х+14+21х=55

59-4х=55

-4х=55-59

-4х=-4

х=1

_______

9х+2(18-4х)=10+3(3х-2)

9х+36-8х=10+9х-6

х+36=4+9х

х-9х=4-36

-8х=-32

х=4

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