Question

05. Resolva a equação: a) 2x + 7x – 10 = 4x + 3 – 2x b) 8 – 2 (x + 5) = 5 + 3 (2x + 4) c) 2m + 6 = m d) 3 (2x + 4) = 4 (x + 6)

Answer 1

a)

2x + 7x - 10= 4x + 3 - 2x

2x + 7x - 4x + 2x= 3 + 10

7x= 13

x= 13/7

b)

8 - 2(x + 5)= 5 + 3(2x + 4)

8 - 2x - 10= 5 + 6x + 12

- 2x - 6x= 5 + 12 - 8 + 10

- 8x= 19 >>.(-1)

8x= - 19

x= - 19/8

c)

2m + 6= m

2m - m= - 6

1m= - 6

m= - 6/1

m= - 6

d)

3(2x + 4)= 4(x + 6)

6x + 12= 4x + 24

6x - 4x= 24 - 12

2x= 12

x= 12/2

x= 6