Question

Va rog ex 6,7,8 doar ce e incercuit

Answer 1

d) 7-5x = - 13 ;  5x = 7+13 ; x = 20:5 ; x = 4
e) 2-9x=-25 ;  9x = 2+25 ; x =27:9 ; x = 3
c) 4x-1 = -9 ; 4x = -9+1 ; 4x = -8 ; x= -8: 4 ; x = - 4
f) 6-4x = -22 ; 4x = 6+22 ; x = 28:4 ; x=7
ex. 7 
d) 24: (-x) -7 = -13 ; -24x = -13+7 ; -24x = 6 ; x = -6/24 = -1/4

e) 32: (-x) -6 = -10; -32x =-10+6;  -32x = 4; x =-4/32 = -1/8
c) 30:(-x) +1 =-5 ;  -30x=-5+1=-4; x = -4/30
f) 45: (-x) -8 = -13; -45x = -13+8 = 5 ; x=-5/-45 = -1/9
ex 8 :
a) 4x-6 = 2x-14
4x-2x = 6-14
6x = -8 
x = -8/6
x= -4/3
b) 7x +15=4x-6
7x-4x = -15-6
3x = -21
x = -21/3
x = -7
c) 8x-5=4x-17
8x-4x = -17+5
4x = -12
x = -12/4
x=-3
d) 10 - 2x = 3x -15
10+15 = 3x+2x
25 = 5x
x= 25:5
x=5
e) 13-7x =23-2x 
13-23 = 7x-2x
-10 = 5x
x= -10/5
x = -2

f)  39-9x = 21-3x
39-21 = 9x-3x
18 = 6x
x = 18/6
x = 3