Question

Simplifique as equações e,em seguida,resolva-as.
B) 6 . ( x - 2 ) = 12

C) 10 x + 4 . ( 3 - 2 x ) - 6 = 8

D) 3 . ( 5 + 3 x ) + 5 . ( - x - 1 ) = 22

Answer 1

b) 6 . ( x - 2 ) = 12
    6x - 12 = 12
    6x = 12 + 12 
    6x = 24
    x = 24/6
    x = 4

c) 10x + 4 . ( 3 - 2x ) - 6 = 8
    10x + 12 - 8x - 6 = 8
    2x + 6 = 8
    2x = 8 - 6
    2x = 2
    x = 2/2
    x = 1

d) 3 . ( 5 + 3x ) + 5 . ( -x - 1 ) = 22
    15 + 9x - 5x - 5 = 22
     4x + 10 = 22
     4x = 22 - 10
     4x = 12
     x = 12/4
     x = 3