Question

Rezolvati in Z ecuatiile :

a) 2x + 3 = -7
b) 3 ( x + 5 - 2 = 2( x - 1 ) - 5
c) 5 ( x -7 ) -3 ( x - 3 ) + 17 = 11
d) - 3 ( x + 1 ) - 2 ( 1 - 2x ) - ( x + 5 ) = 17 - x

Va rog dau 30 puncte

Answer 1

a)2x=-7-3
2x=-10
x=-5
b)3x+15-2= 2x-2-5
3x-2x=-7-15+2
x=-20
c)5x-35-3x+9+17=11
2x=11-17-9+35
2x=20
x=10
d) -3x-3-2+4x-x-5=17-x
-3x+4x-x+x=17+3+2+5
x=27

Answer 2

a)
2x + 3 = -7
2x = -7 - 3 
2x = -10 
x = -10 : 2 
x = -5 

b)
3 ( x + 5 - 2 = 2( x - 1 ) - 5
3x +15 - 2 = 2x - 2 - 5 
3x - 2x = -13 -2-5 
x = - 20 

c)
5 ( x -7 ) -3 ( x - 3 ) + 17 = 11
5x - 35 - 3x +9  +17 = 11 
2x = 11 + 9
x = 20 : 2 
x = 10 

d)
- 3 ( x + 1 ) - 2 ( 1 - 2x ) - ( x + 5 ) = 17 - x
-3x  - 3 - 2 +4x - x - 5 = 17 - x 
x = 17 +10 
x = 27