Verified answer

420= A + (A - 60)

420 + 60= 2 A

480 = 2 A

A = 240 ------------- A -60 = 180

Resposta 240 e 180

x + y = 420

x = y - 60

y - 60 + y = 420

2y = 480

y = 240

x = 240 - 60

x = 180

x+y=420

x=y-60

y-60+y=420

2y=420+60

2y=480

y=480/2

y=240

x=y-60

x=240-60

x=180

420 -60 = 360

380 /2 = 180

180 + 60 = 240

240 + 180 = 420