Question

Resolva as Equaçoes:

A) 6 + x = 6,4

B) 0,5 x - 9 = 1,5

C) 5 x + 2 = 2 x - 1

D) 6 - 3 x = - 10 - 4 x

E) 2 ( 3 x - 5 ) = 14

J) 2 x - 1 = 3
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5

Answer 1

a) 6 + x = 6,4
x = 6,4 - 6
x = 0,4

b) 0,5x - 9 = 1,5
0,5x = 1,5 + 9
0,5 = 10,5
x = 10,5/0,5
x = 21

c) 5x + 2 = 2x -1
5x - 2x = -1 -2
3x = -3
x = -3/3 = -1

d) 6 - 3x = -10 - 4x
-3x + 4x = -10 - 6
x = -16

e) 2(3x -5) = 14
6x - 10 = 14
6x = 14 + 10
6x = 24
x = 24/6 = 4

j) 2x/5 -1 = 3
2x - 1.5 = 3.5
2x -5 = 15
2x = 15 + 5
2x = 20
x = 20/2 = 10