x - 200 = 400 x 3
x - 200 = 1200
x = 1200 - 200
x = 1000
x + 130 = 200 - 100
x + 130 = 100
x = 100 - 130
x = -30
x - 200 = 400 x 3
x - 200 = 1200
x = 1200 - 200
x = 1000
x + 130 = 200 - 100
x + 130 = 100
x = 100 - 130
x = -30
x - 200 = 400 x 3 x + 130 = 200 - 100
x - 200 = 1200 x + 130 = 100
x = 1200 + 200 x = 100 - 130
x = 1400 x = -30
bạn nợ mik 1 cái k nhé
x - 200 = 400 x 3
x - 200 = 1200
x = 1200 + 200
x = 1400
x + 130 = 200 - 100
x + 130 = 100
x = 100 - 130
x = - 30
K mk nha
x - 200 = 400 x 3
x - 200 = 1200
x = 1200 + 200
x = 1400
=> Vậy : x = 1400
x + 130 = 200 - 100
x + 130 = 100
x = 100 - 130
x = -30
=> Vậy : x = -30
k mình
k lại
x - 200 = 400 x 3
x - 200 = 1200
x = 1200 + 200
x = 1400 x + 130 = 200 - 100
x + 130 = 100
x = 100 - 130
x = - 30
x-200=400x3 x+130=200-100
x-200=1200 x+130=100
x =1200-200 x =100-130
x =1000 x = -30
x-200=400x3 x-200=1200 x =1200+200 x =1400. x+130=200-100 x+130=100 x =
x - 200 = 400 x 3
x - 200 = 1200 x + 130 = 200 - 100
x = 1200 + 200 x = 100
x = 1400 x = - 30
a,x=1200-200
x= 1000
b, x+130=100
x=-30