Question

valor de x nas equações:
a) x + 4 ( x - 1) = 9 - 2 (x + 3)
b) 10 - (2x + 1) = 4 (2x + 3)
c) x - (x - 1) = 12 - (3x - 2)
d) 5x - (x - 2) = 2 - 3 (x + 5)
e) 4 (x - 2) + 3 (2x - 1) = 6 (2x - 3)

Answer 1

a) x + 4 ( x - 1 ) = 9 - 2 ( x + 3 )
x + 4x - 4 = 9 - 2x - 6
x + 4x + 2x = 9 - 6 + 4 
7x = 7
x = 7/7
x = 1

b) 10 - ( 2X + 1 ) = 4 ( 2X + 3 )
10 - 2X - 1 = 8X + 12
- 2X - 8X = 12 - 10 + 1 
- 10X = 3 ( - 1 )
10X = - 3
X = -3/10

C) x - ( x - 1 ) = 12 - ( 3x - 2 )
x - x + 1 = 12 - 3x + 2
x - x + 3x = 12 + 2 - 1
3x = 13
x = 13/3

d) 5x - ( x - 2 ) = 2 - 3 ( x + 5 )
5x - x + 2 = 2 - 3x - 15
5x - x + 3x = 2 - 15 - 2
7x = -15
x = -15/7

e) 4 ( x - 2 ) + 3 ( 2x - 1 ) = 6 ( 2x - 3 )
4x - 8 + 6x - 3 = 12x - 18
4x + 6x - 12x = - 18 + 8 + 3 
- 2x = - 7 ( - 1 )
2x = 7
x = 7/2