De ma de minh giai cho , ko can chi can nick 1 cai la douc roi :
(x+5)+(x-9)=x+2
x+5+x+9=x+2
2x+14=x+2
ko viet vao vo nhe : trong truong hop nay ta bo bot 2 ben moi ben 1 con x
x+14=2
x=2-14
Vay x=-12, x=am 12 nhe . Dau tru to viet hoi nho chut
Cac ban xem va an **** cho minh nhe . Cam on