Question

valor de x nas equações:
a) 1+4 (x - 5) = 0
b) 7(x - 1) = 2 (3x + 1)
c) 3 (x + 2) + 5 = x + 12
d) 5 (3x - 2) = 2 ( 6x + 3 )
e) 2 (3x - 1) + 2 (3 - x) = 8

Answer 1

1 + 4 ( x - 5 ) = 0
1 + 4x - 20 = 0
4x = -1 + 20
4x = 19
x = 19/4

b) 7 ( x - 1 )= 2 ( 3x + 1 )
7x - 7 = 6x + 2
7x - 6x = 2 + 7
x = 9

c) 3 (x + 2 ) + 5 = x + 12
3x + 6 + 5 = x  + 12
3x - x = 12 - 6 - 5
2x = 1
x = 1/2

d)5 (3x - 2 ) = 2 (6x + 3)
5x - 10 = 12x + 6
5x - 12x = 6 + 10
- 7x = 16 ( - 1 )
7x = - 16
x = - 16/7

e) 2 ( 3x - 1 ) + 2  ( 3 - x ) = 8
6x - 2 + 6 - 2x = 8
6x - 2x = 8 + 2 - 6
4x = 4
x = 4/4
x = 1