Question

determine o valor de x

a)
$x - 5 = 45$
b)
$4x - 20 = 4 - 2x$
c)
$x + 12 = 40 - 4x$
d)
$9x - 4x + 30 = 7x - 60$
e)
$4x + 8 = 42$
f)
$9x = 6x + 60$
g)
$5x - 6 = 3x + 12$
h)
$2x + 9 = x + 16$
i)
$5y + 12 = 8y - 27$
j)
$4x - 8 = 3x + 9$
me ajudem!!!!!!!

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Answer 1

Resposta:

x - 5 = 45

x = 45 + 5

x = 50

4x - 20 = -2x + 4

4x + 2x = 4 + 20

6x = 24

x = 24/6

x = 4

x + 12 = -4x + 40

x + 4x = 40 - 12

5x = 28

x = 28/5

x = 28/5

5x + 30 = 7x - 60

5x - 7x = -60 - 30

-2x = -90

x = 90/2

x = 45

4x + 8 = 42

4x = 42 - 8

4x = 34

x = 34/4

x = 17/2

9x = 6x + 60

9x - 6x = 60

3x = 60

x = 60/3

x = 20

5x - 6 = 3x + 12

5x - 3x = 12 + 6

2x = 18

x = 18/2

x = 9

2x + 9 = x + 16

2x - x = 16 - 9

x = 7

5y + 12 = 8y - 27

5y - 8y = -27 - 12

-3y = -39

y = 39/3

y = 13

4x - 8 = 3x + 9

4x - 3x = 9 + 8

x = 17