Question

50x + 200 = 20 (x - 4) + 100 ?

Answer 1

50x+200=20(x-4)+100
50x+200=20x-80+100
50x-20x=-80+100-200
30x=-180
x= -180/30
x= -6

Espero ter ajudado.

Answer 2

50x + 200  = 20x - 80 + 100

50x -20x  = - 80 + 100 - 200

30 x = - 180

x = - 180
    ----------
          30

x = - 6