Question

Simplifique e resolva as equações:
a) 6.(x-2)= 12
b) 9+2.(5x-4)= 21
c) 10x+4.(3-2x) - 6= 8
d) 3.(5+3x) + 5.(-x -1)= 22
e) 2.(9x-4) - 7 +3(6-5x)= 18

Answer 1

6(x - 2) = 12
6x - 12 = 12
6x = 12 + 12
6x = 24
  x = 24/5
  x = 4 
===========================================
9 + 2(5x - 4) = 21
9 + 10x - 8 = 21
10x + 9 - 8 = 21
10x + 1 = 21
10x = 21 - 1
10x = 20
    x = 20/10
    x = 2 
=========================================
10x + 4(3 - 2x) - 6 = 8
10x + 12 - 8x - 6 = 8
10x - 8x + 12 - 6 = 8
2x + 6 = 8
2x = 8 - 6
2x = 2
 x = 2/2
 x = 1
============================================
3(5 + 3x) + 5( - x - 1 ) = 22
15 + 9x - 5x - 5 = 22
9x - 5x + 15 - 5 = 22
4x + 10 = 22
4x = 22- 10
4x = 12
  x = 12/4
  x = 3
=====================================
2(9x - 4) - 7 + 3(6 - 5x) = 18
18x - 8 - 7 + 18 - 15x = 18
18x - 15x + 18 - 8 - 7 = 18
3x + 3 = 18
3x = 18 - 3 
3x = 15
x = 15/3
x = 5