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Exercițiul 1 va rog!!!!

Exercițiul 1 Va Rog class=

Răspuns :

a) 2x + 5 = 7 + x

2x - x = 7 - 5

x = 2

b) 3 - 7x = 2x + 21

3 - 21 = 2x + 7x

- 18 = 9x

x = -2

c) 1 - 4x = x + 16

1 - 16 = x + 4x

-15 = 5x

x = - 3

d) 7 - 5x = 2x - 7

7 + 7 = 2x + 5x

14 = 7x

x = 2

e) 7 - 2x = 5x - 14

7 + 14 = 5x + 2x

21 = 7x

x = 3

f) 9x - 4 = 5x + 8

9x - 5x = 8 + 4

4x = 12

x = 3

g) 5x - 1 = 8x + 11

5x - 8x = 11 + 1

-3x = 12

x = -4

h) 3x - 1 = 5x + 9

3x - 5x = 9 + 1

-2x = 10

x = -5

i) 6x - 5 = 3x + 7

6x - 3x = 7 + 5

3x = 12

x = 4