Ответ:

Пошаговое объяснение:

3x - 2 = 5

3x = 5 + 2

3x = 7

x = 7 : 3

x = 2цел. 1/3

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5x - 2x + 3 = 6

3x + 3 = 6

3x = 6 - 3

3x = 3

x = 3 : 3

x = 1

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8 - (3/5)x = 14

(3/5)x = 8 - 14

(3/5)x = -6

x = -6 * (5/3)

x = -10

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2)

x * 5 - 12 = 38

5x = 38 + 12

5x = 50

x = 50 : 5

x = 10 задуманное число

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3)

x + x+7 = 23

2x + 7 = 23

2x = 23 - 7

2x = 16

x = 16 : 2

x = 8м во втором куске

8 + 7 = 15м в первом куске

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4)

x = 1 2/3

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

ответ: 3

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5)

2x - 3 - (5x - 4) = 2x - 3 - 5x + 4 = -3x + 1

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6)

3(2x - 1) - 2(5x - 4) - (2 - 4x) = 6x - 3 - 10x + 8 - 2 + 4x = (6x - 10x + 4x) + (-3+8-2) = 0 + 3 = 3

не зависит от x