Resposta :
semelhança de triângulos:
5x +2x+5 = 105
------------------------
2x + 5 = 35
(7x+5) = 105
------------------------
(2x + 5) = 35
245x + 175 = 210x + 525
245x - 210x + 175 = 525
35x + 175 = 525
35x = 525 - 175
35x = 350
x = 350 / 35
x = 10
letra e)
5x +2x+5 = 105
------------------------
2x + 5 = 35
(7x+5) = 105
------------------------
(2x + 5) = 35
245x + 175 = 210x + 525
245x - 210x + 175 = 525
35x + 175 = 525
35x = 525 - 175
35x = 350
x = 350 / 35
x = 10
letra e)