Question

a) 3(x-1)=15    b) 5(x+2)=20  c) 4(x-7)=28   d) 6(x+7)=54  e) 72=8(x-1)  f) 98=7(x+4)

Answer 1

3x-3=15                             

3x=15+3

3x=18

x=18:3 => x=6

b) 5x+10=20

5x=20-10

5x=10

x=10:2=5

c)4x-28=28

4x=28+28

4x=56

x=56:4 = 14

d)6x+42=54

6x=54-42

6x=12

x=2

e)72=8x-8

8x=72+8

8x=80

x=80:8=10

f)98=7x+28

7x=98-28

7x=70

x=70:7

x=10  SPER CA TE-AM AJUTAT....:33 cel mai bun? :D