Question

1- Qual valor de x?
$3x = 81 \\ 2x = 64 \\ 7x = 49 \\ 2x = 3x \\ \frac{1}{2} x = \frac{1}{32}$
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Answer 1

3x=81

x=81/3

x=27

2x=64

x=64/2

x= 32

7x=49

x=49/7

x=7

2x=3x

3x-2x=0

x=0

$\frac{1}{2} x = \frac{1}{32}$

$x = \frac{1}{32} - \frac{1}{2}$

mmc

2,32|2

1,16|2

1,8|2

1,4|2

1,2|2

1,1

2.2.2.2.2= 32

$x = \frac{1 - 16}{32} \\ \\ x = \frac{ - 15}{32}$

Answer 2

3x=81
x=81:3 (esses dois pontos significa divisão)
x=27

2x=64
x=64:2
x=32

7x=49
x=49:7
x=7

2x=3x
2x-3x=0
(-1)-1x=0
1x=0
x=1

1:2x=1:32
2x=32
x=32:2
x=16

Pronto está aí