Question

Determine o valor de x nas equações a seguir: a) x + 5 = 2x – 8 b) 3x – 2 = 7x + 10 c) 3 – 2 . (x + 3) = x – 18 d) 50 + (3x − 4) = 2 . (3x – 4) + 26

Answer 1

a) x+5=2x-8

x-2x= -8-5

-x= -13 .(-1)

x=13

b)3x-2=7x+10

3x-7x=10+2

-4x=12 .(-1)

4x= -12

x= -12/4

x= -3

c) 3-2.(x+3)=x-18

3-2x-6=x-18

-2x-x=-18-3+6

-3x=-15 .(-1)

3x=15

x=15/3

x=5

d)50+(3x-4)=2.(3x-4)+26

50+3x-4=6x-8+26

3x-6x=-8+26-50+4

-3x=-28 .(-1)

3x=28

x=28/3