Question

E urgente por favor!!!!!!!

Answer 1

a)
x + 30 = 40 
x = 40 - 30
  x= 10

b)
30 - 20 +2x = 10
2x=10 - 30 + 40
2x= 20
x= 20/2
x= 10

c) 
3x - 10 +13 = - 2x + 28
3x + 2x = 28 + 10 - 13
5x= 25
x=25/5
x=5

d) 
20x - 30 = 40 + 30 - 20
20x= 40 + 30 - 20 + 30
20x= 80
x= 80/20
x=4

e)
- 5x +45 - 89 = -90 +41
45 - 89 +90 - 41 = 5x
5=5x
5/5=x
1=x

f) 
10x - 20 = 40 + 50
10x= 40 + 50 +20
10x= 110
x= 110/10
x=11

 g) 
20 - 80 +2x =10
2x= 10 - 20 + 80
2x= 70
x = 70/2
x = 35

h) 
19 + 2x - 13 = 10 - 20
2x = 10 - 20 - 19 + 13
2x = -16 
x = -16/2
x= -8

i)
10x-12 +10 = 18 - 20
10x = 18 - 20 - 10 + 12
10x = 0 
x = 10/0
x = 0

j) 
13x - 23 - 45 = - 7x + 12
13x +7x = 12 + 23 + 45
20x = 80
x = 80/20
x = 4