Question

a)×+12=5
b)×+4=100
c)3×-×=9-7
d)5×=9-4×
e)×-1+7=5×
f)7×+2=3×​

Answer 1

Explicação passo-a-passo:

a)

x + 12 = 5

x = 5 - 12

x = -7

b)

x + 4 = 100

x = 100 - 4

x = 96

c)

3x - x = 9 - 7

2x = 2

x = 2/2

x = 1

d)

5x = 9 - 4x

5x + 4x = 9

9x = 9

x = 9/9

x = 1

e)

x - 1 + 7 = 5x

x + 6 = 5x

x - 5x = -6

-4x = -6 .(-1)

4x = 6

x = 6/4

x = 3/2

x = 1,5

f)

7x + 2 = 3x

7x - 3x = -2

4x = -2

x = -2/4

x = -1/2

x = -0,5