Question

Ex 2 va rog frumos!! ​

Answer 1

Răspuns:

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

6x + 3 - 4x + 12 = 5 - 4x - 2

2x + 15 = 3 - 4x

2x + 4x = 3 - 15

6x = -12

x = -12 : 6

x = -2

b) 5x - 6 - 3(x + 4) = 3(x - 5) - 7

5x - 6 - 3x - 12 = 3x - 15 - 7

2x - 18 = 3x - 22

2x - 3x = 18 - 22

-x = - 4

x = 4

c) 2[15 - 4(3x - 8)] - 7 = 3(18 - 5(2x - 3)] + 18

2(15 - 12x + 32) - 7 = 3(18 - 10x + 15) + 18

2(47 - 12x) - 7 = 3(33 - 10x) + 18

94 - 24x - 7 = 99 - 30x + 18

87 - 24x = 117 - 30x

-24x + 30 x = 117 - 87

6x = 30

x = 5

Explicație pas cu pas: