Question

37 Resolva as equações.
a) 7(x - 2) = 5(x + 3)
b) 2(x - 5) + 4(x - 1) = 0
c) 3(2x - 1) = - 2(x + 3)
d) 7(x - 1) - 2(x - 5) = x - 5
Me ajudem prf. Obrigada​

Answer 1

a)

7(x - 2)= 5(x + 3)

7x - 14= 5x + 15

7x - 5x= 15 + 14

2x= 29

x= 29/2

b)

2(x - 5) + 4(x - 1)= 0

2x - 10 + 4x - 4= 0

2x + 4x= 0 + 10 + 4

6x= 14

x= 14/6

x= 7/3

c)

3(2x - 1)= - 2(x + 3)

6x - 3= - 2x - 6

6x + 2x= - 6 + 3

8x= - 3

x= - 3/8

d)

7(x - 1) - 2(x - 5)= x - 5

7x - 7 - 2x + 10= x - 5

7x - 2x - x= - 5 + 7 - 10

4x= - 8

x= - 8/4

x= - 2