Respuesta :
200x-90=400x+10
200x = 400x +100
200x - 400x = 100
-200x = 100
x = 100/-200
x = -1/2
Hope this will help....
x=-2
200x-90=400x+10
-200x. -200x
-90=200x+10
-10 -10
-100= 200x
-100 -100
x =-2
200x-90=400x+10
-200x. -200x
-90=200x+10
-10 -10
-100= 200x
-100 -100
x =-2