Question

Resolva as equações:
a) 2(x - 5) + 4(x - 1) = 4




b) 3(x + 10) - 2(x - 5) = 0





c) 2( x - 1) - 7 = 16







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

Answer 1

a)

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

2x - 10 + 4x - 4= 4

2x + 4x= 4 + 10 + 4

6x= 18

x= 18/6

x= 3

b)

3(x + 10) - 2(x - 5)= 0

3x + 30 - 2x + 10= 0

3x - 2x= 0 - 30 - 10

x= - 40

c)

2(x - 1) - 7= 16

2x - 2 - 7= 16

2x= 16 + 2 + 7

2x= 25

x= 25/2

x= 12,5

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