Question

resolva as equações
a) x+3 = 7 b)2x-5=x+4 c) 9-4x-4=x+7-1
d) 16x+5-3=-2x-15 h)10-6(z-8)=9+z i)12+2n=9(n-7)-2

Answer 1

A) x = 7 - 3

 x = 4

B) 2x - x = 4 + 5

x = 9

C) -4x -x = 7 - 1 - 9 + 4
 -5x = 1 . ( -1 )
      -1
x = ----
      5

D) 16x +2x = -15 -5 +3
 18x = -17
      -17
x = -----
       18

H) z - z = 9 + 8 + 6 -10
0(0z)= 23 -10  

0(0z) = 13

I)2n - n = 9 - 12 - 7 - 2
n =9 - 21

n = -12