Question

Determine a raiz de cada equação a seguir(resola descobrindo o valor do termo x desconhecido),considerando U=Q:
a)x-17=-9
b)3.(x+2)+5=x+12
c)2x+-7
d)x+4.(x-1)=9-2.(x+3)
e)3x+2=2x-11
f)5.(3x-2)=2.(6x+3)
g)2x=16
h)2.(3x-1)+2.(3-x)
i)7.(x-1)=2.(3x+1)
j)2x+14=5x-1
k)2.(3-y)+7.(2-y)=15-4y
l)4x-5=6x+11
m)2.(x-2)+5.(2-x)+6.(x+1)=0
n)5x+4-2x=26-3x

Answer 1

a)x-17=-9
   x = -9 +17
   x = +8

b)3.(x+2)+5=x+12
   3x+6 +5 = x +12
   3x -x = 12 -6 -5
   2x = 12 -11
   2x = 1
     x = 1/2

c)2x+-7 =
   2x = 7
     x = 7/2 (+/-)

d)x+4.(x-1)=9-2.(x+3) 
   x +4x -4 = 9 -2x + 27 
   x +4x +2x = 9 +27 +4
   7x = 40
     x = 40/7

e)3x+2=2x-11
   3x -2x = -11 -2
   x = -13

f)5.(3x-2)=2.(6x+3) 
  15x - 10 = 12x + 6
  15x -12x = 6 +10
   3x = 16
     x = 16/3

g)2x=16
     x = 16/2
     x = 8

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

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

j)2x+14=5x-1
  2x -5x = -1 -15
  -3x = -16
     x = -16/-3
     x = 16/3

k)2.(3-y)+7.(2-y)=15-4y
   6 -2y + 14 -7y = 15 -4y
   -2y -7y +4y = 15 -6 -14
   -9y +4y = 15 -20
   -5y = -5
      y = -5/-5
      y = +1

l)4x-5=6x+11
  4x -6x = 11 +5
  -2x = 16
     x = 16/-2
     x = -8

m)2.(x-2)+5.(2-x)+6.(x+1)=0
    2x -4 +10 -5x +6x +6 = 0
    3x -5x +6x = 4 -10 -6
    9x -5x = 4 - 16
    4x = -12
      x = -12/4
      x = -3

n)5x+4-2x=26-3x
   5x -2x +3x = 26 -4
   6x = 22
     x = 22/6    simpl. 2
     x = 11/3