Question

resolva as seguintes equações ​

Answer 1

b)

x - 5= 7

x= 7 + 5

x= 12

c)

10x= 20 + 9x

10x - 9x= 20

x= 20

d)

2x + 6= x

2x - x= - 6

x= - 6

e)

2x + 1= 15

2x= 15 - 1

2x= 14

x= 14/2

x= 7

f)

x + 6= 2 - 3x

x + 3x= 2 - 6

4x= - 4

x= - 4/4

x= - 1

g)

5 - x - 20= 5x - 10 - 7x

- x - 5x + 7x= - 10 - 5 + 20

x= 5

h)

- 40= - 10x

10x= 40

x= 40/10

x= 4

____________________

a)

x + 2x= 72

3x= 72

x= 72/3

x= 24

c)

3x + 15= 39

3x= 39 - 15

3x= 24

x= 24/3

x= 8

d)

64 - 9 ÷ 5

55 ÷ 5

11