Question

macie w załączniku daje naj ​

Answer 1

1) 2x+4=27

2x=27-4

2x=23

x=11,5

2) 5(9-2x)=30

45-10x=30

10x=45-30

10x=15

x=1,5

3) 2(3x-7)-3(5x+4)=21x-6

6x-14-15x-12=21x-6

9x-26=21x-6

9x-21x=-6+26

-12x=20

x=-1

4) (5x+1)/5-(7x-2)2=2,5x+3 //*10

2(5x+1)-5(7x-2)=25x+30

10x+2-35x+10=25x+30

10x-35x-25x=30-10-2

-50x=18

x=

5) (7x-31)/17=1-x //*17

7x-31=17-17x

7x+17x=17+31

24x=48

x=2

licze na naj;)