Question

Resolva as seguintes equações:

b) 30 - 20 + 2x = 10
c) 3x - 10+ 13 = 2x + 28
d) 20x - 30 = 40 + 30 - 20
e) 5x + 45 - 89 = 90 +41
f) 10 x - 20 = 40 + 50
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Answer 1

Oi...

b)

30 - 20 + 2x = 10

2x = 10 + 20 - 30

2x = 30 -30

2x = 0

x = 0/2

x = 0

c)

3x - 10 + 13 = 2x + 28

3x - 2x = 28 + 10 - 13

x = 38 -13

x = 25

d)

20x - 30 = 40 + 30 - 20

20x = 40 + 30 - 20 + 30

20x = 100 - 20

20x = 80

x = 80/20

x = 4

e)

5x + 45 - 89 = 90 + 41

5x = 90 + 41 + 89 - 45

5x = 220 - 45

5x = 175

x = 175/5

x = 35

f)

10x - 20 = 40 + 50

10x = 40 + 50 + 20

10x = 110

x = 110/10

x = 11

Boas lições.

Answer 2

b)2x=10-10
2x=0
x=0/2
x=0

c)3x-2x=28-3
x=25

d)20x=50-30
20x=20
x=20/20
x=1

e)5x=131+44
5x=175
x=175/5
x=35

f)10x=90+20
10x=110
x=110/10
x=11