Question

resolva as equações:

a) x + 3 = 15

b) 2x -5 = x + 20

c) 3x +8 = x + 20

d) 5x -10 = 3x​

Answer 1

a) x + 3 = 15

x = 15 - 3

x = 12

b) 2x -5 = x + 20

2x - x - 5 = 20

x - 5 = 20

x = 20 + 5

x = 25

c) 3x +8 = x + 20

3x - x + 8 = 20

2x + 8 = 20

2x = 20 - 8

2x = 12

x = 12/2

x = 6

d) 5x - 10 = 3x

5x - 3x - 10 = 0

2x - 10 = 0

2x = 10

x = 10/2

x = 5