2x + 2x+3 = 576
2x + 2x.23 = 576
2x(1 + 23) = 576
2x.9 = 576
2x = 576 : 9
2x = 64
2x = 26
=>x = 6
5.2x+1 = 80
2x+1 = 80 : 5
2x+1 = 16
2x+1 = 24
=>x+1 = 4
x = 4 - 1
x = 3
200 - (254 : x + 3) : 2 = 262
200 - (254 : x + 3) = 262 . 2
200 - (254 : x + 3) = 524
254 : x + 3 = 200 - 524
254 : x + 3 = -324
254 : x = -327
x = 254 : (-327)
x = \(-\frac{254}{327}\)