x+100=-100
x = -100 - 100
x = -200
x+300=200
x = 200-300
x =-100
k nha!
x+100=-100
x=-100-100-200
x+300=200
x=200-300
x=-100
a)x+100=200-300
x+100=(-100)
x =(-100)-100
x =(-200)
b)x+300=200
x =200-300
x =-100
x+100=200-300
x+100=-100
x=-100-100
x=-200
x+300=200
x=200-300
x=-100
x + 100 = -100
x = -100-100
x = -200
x + 300 = 200
x = 200-300
x = -100