Question

Qual o valor de X?
A) 2.( 3x-1) +2. (3-x)=0
B)7. (x-1)=2 (3x+1)
C)2. (3- y)+7.(2-y) =15-4y

Answer 1

A) 2.(3x - 1) + 2.(3 - x) = 0
6x - 2 + 6 - 2x = 0
4x + 4 = 0
4x = 4
x = 4/4
x = 1

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

C)2.(3 - y) + 7.(2 - y) = 15 - 4y
6 - 2y + 14 - 7y = 15 - 4y
- 9y + 4y = 15 - 6 - 14
- 5y = - 5
y = - 5/- 5
y = 1