Question

Tính: 5-x=15-x (giúp mình với) :))

Answer 1

\(5-x=15-x\)

=> \(5-15=x-x\)

=> \(-10=0\left(sai\right)\)

Vậy \(x\in\varnothing\)

Answer 2

nham , to lam sai ban duong ba gia bao lam dung

Answer 3

5 - x = 15 - x

=> 5 - ( - 15 ) = -x - x

=> 20 = -2x

x = 20 : -2

x = -10