Question

o conjunto soluçao das equaçoes:
a) 2x-4-8=4x
b)2(x-1)=3x+4
c)x-7= 5
   3      3

Answer 1

a)
2x- 4 - 8 = 4x 
2x - 4x = 8 + 4 
-2x = 12 (-1)
2x = -12
$x = - \dfrac{12}{2} \\ \\ x = -6$

b)
2(x - 1)= 3x + 4
2x - 2 = 3x + 4 
2x - 3x = 4 + 2
-x = 6 (-1)
x = -6 

c)

$\dfrac{x-7}3} = \dfrac{5}{3}$

mmc = 3

$\dfrac{x- 7 - 5}{3} = 0 \\ \\ x - 7 - 5 = 0 \\ x - 12 = 0 \\ \\ x = 12$