x + 700 = 100 + 700

x + 700 = 800

x           = 800 - 700

x           = 100

=100 tk va kb nhe

=100 nha

x + 100 = -300

      x = -300 -100

      x = -400

x + 700 = 900 - 700

x + 700 = 200

         x = 200 - 700

        x = -500

_x+100=-300

_x=-300-100

_x=-400

_x+700=200

_x=200-700

_x=-500

x + 100 = 300 - 600

x + 100 = - 300

x          = - 300 - 100

x          = - 400

x+700=900-100

x+700=800

x        = 800-700

x         = 100

x+300=400+500

x+300=900

x       = 900-300 

x       = 600

x+100=900+300

x+100= 1200

x        = 1200 - 100

x       = 1100

x+700=900-100

x+700=800

x       =800-700

x       =100

x+300=400+500

x+300=900

x       =900-300

x       =600

x+100=900+300

x+100=1200

x      =1200-100

x      =1100

x + 700 = 900 - 100

x + 700 = 800

x = 800 - 700

x = 100

x + 300 = 400 + 500

x + 300 = 900

x = 900 - 300

x = 600

x + 100 = 900 + 300

x + 100 = 1200

x = 1200 - 100

x = 1100

x=-500

x + 100 = 200 - 700 + 100

x + 100 = - 500 + 100

x + 100 = - 400

x          = - 400 - 100

x          = - 500

x+100=200-700+100

x+100=-500+100

x+100=-400

x=-400-100

x=-500

x + 100 = 200 - 700 - 100

x + 100 = - 500 - 100

x + 100 = - 600

x          = - 600 - 100

x          = - 700

x + 100 = 200 - 700 - 100

x + 100 = -600

x = -600 - 100

x = -700

x+100=200-700-100

x+100=-500-100

x+100=-600

x=-600-100

x=-700

x + 100 = 700 - 300

x + 100 = 400

x = 400 - 100

x = 300

x+100=700-300

x+100=400

x      =400-100

x       =300

 mk k bn ở câu này rùi k mk nhé

x + 100 = 700-300

x+100=400

x=400-100

x=300

k mk nha

x + 100 = 900 - 700

x + 100 = 200

x = 200 -100

x = 100

x + 100 = 900 - 700

x + 100 =200

x           = 200 - 100

x           = 100

Vậy x = 100

x + 100 = 900 - 700

x + 100 = 200

         x = 200 - 100

         x =100

x + 300 = 700 - 100

x + 300 = 600

x            = 600 - 300

x             = 300

Vậy x = 300

x+300=600

x=600-300

x=300

ai tk minh minh tk lai

x + 300 = 700 - 100

x + 300 = 600

x = 600 - 300

x = 300

x + 100 = 200 + 700

x + 100 = 900

x          = 900 - 100

x           = 800

x+100=900

x=900-100

x=800

x  +100 = 200 + 700

x + 100 = 900

x = 900 - 100

x = 800