Question

Tìm x:

a) 3x+7= 13

b) 5x -9= 11

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Answer 1

x=2 b)x=4

Answer 2

a) 3x=6

x=2

b) 5x=20

x=4

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Answer 3

a,3x+7=13

3x=13-7

3x=6

x=6:3

x=2

b,5x-9=11

5x=11+9

5x=20

x=20:5

x=4

Answer 4

a)x=2 b)x=4

Answer 5

a)

<=> 3x= 13 - 7

<=> 3x = 6

=> x = 6 : 3

=> x = 2

b)

<=> 5x = 11 + 9

<=> 5x = 20

<=> x = 20 : 5

=> x = 4