Question

8. Rezolvati in Z ecuatiile:
a) 2(x + 1)-9= x - 5:
b) 3(x - 2) + 6 = 4x + 3
c) 7x + 3 = 5(x - 1) + 3:
d) 6-3(x-5)= 4x+7:
e) 2x - 7(x + 1) = 3x + 1;
10 - (4x - 3) = -3(2x + 3)
8 8 - 5(x - 2) = 4 +36 + 2); h) 2x + 3(3-X) = 1-(2-
1 20--1)-3(x-2) = 4x+1)-5(2-x);
j) 7x-4(2x + 3) = 2(4x - 3) + 3(2-x).​

Answer 1

a) 2x + 2 - 9 = x - 5

2x - x = -2 + 9 + 5

x = 12.

b) 3x - 6 + 6 = 4x + 3

3x - 4x = 6 - 6 - 3

-x = -3.

c) 7x + 3 = 5x - 5 + 3

7x - 5x = -3 + 5 - 3

2x = -1

x = -1/2.

d) 6 - 3x - 15 = 4x + 7

3x - 4x = 6 - 15 - 7

-x = -2.

e) 2x - 7x + 7 = 3x + 1

2x - 7x - 3x = 7 - 1

-2x = 6

x = 6/-2

x = -3.

f) 40x - 30 = -6x + 9

40x + 6x = -30 - 9

46x = -21

x = -21/46.

g) 88 - 5x - 10 = 42

5x = 88 - 10 - 42

5x = 36

x = 36/5.

h) 2x + 9 - 3x = 1 - 1

2x - 3x = 9 - 1 + 1

-x = 7.

j) 7x - 8x + 12 = 8x - 6 + 6 - 3x

7x - 8x - 8x + 3x = 12 + 6 - 6

-4x = 12

x = 12/4

x = 3.