Question

Resolva : a)X-7=-7
b)X+20=15
c)-4x=1
d)3x-4=2x+8

Answer 1

a) x-7= -7
x= -7 +7
x= 0

b) x+20= 15
x= 15-20
x= -5

c) -4x= 1 (-1)
4x= -1
x= -1/4

d) 3x-4 = 2x+8
3x-2x = 8+4
x= 12

Answer 2

a) x-7 = -7
   x = -7+7=
  x = 0
b) x + 20 = 15
  x = 20 - 15 =
 x = 5

c) -4x = 1 (-1)
   4x = -1
   x= 4/ -1=
   x = -4

d) 3x- 4 = 2x + 8
   3x-2x = 8+ 4 =
   1x = 12 =
   x = 12/1 = 
  x = 12