Question

3×+7=5

-2×+7=3+4

14×+7×-3=4+9

10(×+2)=4(×+7)

Answer 1

Resposta:

3×+7=5

3x = 5 - 7

3x = -2

x = -2/3

-2×+7=3+4

-2x = 7-7

x = 0/-2

x = 0

14×+7×-3=4+9

21x -3 = 13

21x = 13 - 3

21x = 10

x = 10/21

10(×+2)=4(×+7)

10x+20 = 4x+28

10x-4x = 28-20

6x = 8

x = 6/8 simplificando por 2

x = 3/4