Så se afle numărul natural x:
a 3x = x + 2
c) 7x - 3=6X
e) 5.8-2+x=5x-1
g) 2(x+3) = x + 14
i) 3(x+2)+3=2x+10
k) 4(x+3)+2(2x - 2) = 5x + 14
m) 7x+5(X+3) - 10x = x + 20
o) 4(2x+3)-8=7(x+1)
b) 5x = 2x +9
d) 5x -4 = 2x+2
1) 5x + 12 = 3x + 20
h) x + 5+2(x - 1) = x + 19
j) 2(2x+3)+1 = 3(x+4)
1) 3(x+2)+2(x+4) = 4x +29
n) 2(x + 5) -x +3(x - 1) = 35​


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Răspuns :

a) 3x=×+2

3x-x=2 (se trece numarul dupa egal cu semnul schimbat)

2x=2

x=2:2=1

c) 7x-3=6x

7x-6x=3

x=3

e) 5.8-2+x=5x-1

3.8+x=5x-1

x-5x= -1-3.8

-4x= -4.8

x=1.2

g) 2(x+3)=x+14

2x+6=x+14

2x-x=14-6

x=8

i) 3(x+2)+3=2x+10

3x+6+3=2x+10

3x-2x=10-6-3

x=1

k) 4(x+3)+2(2x-2)=5x+14

4x+12+4x-4=5x+14

4x+4x-5x=14-12+4

3x=6

×=2

m) 7x+5(x+3)-10x=x+20

7x+5x+15-10x=x+20

7x+5x-10x-x=20-15

x=5

o) 4(2x+3)-8=7(x+1)

8x+12-8=7x+7

8x-7x=7-12

x= -5

b) 5x=2x+9

5x-2x=9

3x=9

x=3

d) 5x-4=2x+2

5x-2x=2+4

3x=6

x=2

1) 5x+12=3x+20

5x-3x=20-12

2x=8

x=4

h) x+5+2(x-1)=x+19

x+5+2x-2=x+19

x+2x-x=19-5+2

2x=16

x=8

j) 2(2x+3)+1=3(x+4)

4x+6+1=3x+12

4x-3x=12-6-1

x=5

1) 3(x+2)+2(x+4)=4x+29

3x+6+2x+8=4x+29

3x+2x-4x=29-6-8

x=15

n) 2(x+5)-x+3(x-1)=35

2x+10-x+3x-3=35

2x-x+3x=35-10+3

4x=28

x=7