Question

Resolva as equações:
a) 3x – 2x + 10 = 10 + 5x – 40
b) 5(1 – x) – 2x + 1 = –3(2 + x)
c) 50 + (3x − 4) = 2(3x – 4) + 26

Answer 1

Resposta: x - 2x + 10 = 10 + 5x - 40

a) 3x - 2 x -  5x = 10 - 40 - 10

-4 x = - 40

x = - 40 / -4

b) x = 10

5(1-x)-2x+1=-3(2+x)

5 -5x -2x+1 = -6 -3x

5 + 1 -5x-2x = -3x -6

6 -7x = -3x -6

-7x +3x = -6 -6

-4x = -12

x=-12/-4

x = 3

c) 50 + (3x - 4) = 2(3x - 4) + 26

50 + 3x - 4 = 6x - 8 + 26

 

3x - 6x = - 8 + 26 - 50 + 4

-3x = - 28

x = 28/3