Question

3- Resolva as equações a seguir:
a) 3x - 4 = 12
b) 4(x + 10) - 2(x + 7) = 0
c) 3(x - 2) = 15
d) X + 15 + x + x - 12 = 63
e) 5x + 4 = 2(3x + 5)​

Answer 1

a) 3x - 4 = 12

3x = 12 + 4

3x = 16

x = 16/3

b) 4(x + 10) - 2(x + 7) = 0

4x + 40 -2x -14 = 0

2x + 26 = 0

2x = -26

x = -26/2

x = -13

c) 3(x - 2) = 15

3x - 6 = 15

3x = 15 + 6

x = 21/3

x = 7

d) X + 15 + x + x - 12 = 63

3x + 3 = 63

3x = 63 - 3

x = 60/3

x = 20

e) 5x + 4 = 2(3x + 5)

5x + 4 = 6x + 10

5x - 6x = 10 - 4

-x = 6 . (-1)

x = -6