Question

Resolva as equações.
a) 2x + 13 – 4 = 5
b) 10 + 20x = 30x – 5
c) 2(x + 2) – 14 = x – 10

Answer 1

a) 2x + 13 - 4 = 5

2x + 9 = 5

2x = 5 - 9

2x = -4

x = - 4/2

x = -2

b) 10 + 20x = 30x - 5

20x - 30x = -5 - 10

-10x = -15 (.-1)

10x = 15

x = 15/10

x = 3/2

c) 2(x + 2) - 14 = x - 10

2x + 4 - 14 = x - 10

2x - 10 = x - 10

2x - x = -10 + 10

x = 0