repede si astea va implor multtt​

3. 3x+3=5x-7 => 10 =2x, x=5

1.a. x+(-9)=-4 => x =-4+9 =5

b. x-3=-12 => x=-12+3 =-9

c.-7x=28,x=28/-7=-4

d. - 180/x =-18, (impartim totul la - 18) 6/x =1, x=6

2.a+b+c=-9

b=a+1 c=a+2

Inlocuim :a+a+1+a+2=-9, scadem 3

3a = - 12, a =-4,b=-3,c=-2.

3.notam nr cu n.

2n-5=n-3 => n =-3+5 =2

3. 5

1. x+(-9)=-4

x-9=4

x=4+9

x=13

x-3=-12

x=-12+3

x=-9

-7x=28

-7x÷(-7)=28÷(-7)

x=-4

-108÷x=-18

-108÷x=-18

-108/x=-18

108=18x

18x=108

x=6

1+3+5=9