Question

Rezolvati ecuatiile :
a) 2x+7=15
b) 3x-11=21
c) 5+2(x-1) =12
d) 3(x-3)-8=20
e) 15-4(x+1)=10
f )x- 2 supra 3 = 1pe langa si 1supra 15
g) 3 supra 4 -x = 1 supra 12
h) 7 supra 18 + x = 19 supra 15
i) 9 • x = 12
j) x • 4 supra 25 = 16 supra 5
k) 35 supra 24 : x = 2 , (3)
l ) 4x+5 = x + 13
m ) 11x + 17 = 2 x + 21
n) 3x - 1 supra 2 = 3 supra 7 - 4 x
o ) 3 supra 22 x - 1 supra 2 = 6 supra 55 + 1 supra 11 x
p) x supra 2 - x supra 3 = 7 supra 6

Answer 1

a) 2x+7=15 
2x=8
x=4

b) 3x-11=21 
3x=32
x=32/3

c) 5+2(x-1) =12 
2(x-1)=7
x-1=7/2
x=7/2+1
x=9/2

d) 3(x-3)-8=20 
3x=20+8+9
x=37/3

e) 15-4(x+1)=10 
4x+4=5
4x=1
x=1/4

f )x- 2/3 = 1 1/15 
1 1/15 =16/15
x=16/15+2/3
x=(16+10)/15
x=26/15

g) 3/4 -x = 1/12 
x=3/4-1/12
x=(9-1)/12
x=8/12

h) 7/18 + x = 19/15 
x=19/15-7/18
x=(114-35)/90
x=79/90

i) 9 • x = 12 
x=12/9=4/3

j) x • 4/25 = 16/5
x=16/5 : 4/25
x=16/5 * 25/4
x=20
 
k) 35/24 : x = 2,(3) 
2,(3)=(23-2)/9=21/9=7/3
35/24:x=7/3
x=35/24:7/3
x=35/24 * 3/7
x=5/8

l ) 4x+5 = x + 13 
3x=8
x=8/3

m ) 11x + 17 = 2x + 21 
9x=4
x=4/9

n) 3x - 1/2 = 3/7 - 4 x
7x=3/7+1/2
7x=(6+7) /14
7x=13/14
x=13/98

o ) 3x/22 - 1/ 2 = 6/55 + x/11 
3x/22-x/11=6/55+1/2
(3x-2x)/22 =(12+55)/110          
x/22=67/110
x=67/5

p) x/2 - x/3 = 7/6 
3x-2x =7
x=7