Question

9-25=(7-x)-(25+7)

Answer 1

=>9-25=7-x-25-7

=>7-25-7-9+25

=>x=(7-7)+(25-25)-9

=>x=0+0-9

=>x=-9

Answer 2

\(9-25=\left(7-x\right)-\left(25+7\right)\)

\(-16=7-x-25-7\)

\(-16=7-25-7-x\)

\(-25-x=-16\)

\(x=-25-\left(-16\right)\)

\(x=\)\(-9\)

Vậy \(x=-9\)

Answer 3

9-25=(7-x)-(25+7)

=> 9-25 =7-x-25-7

=> 9=7-7-25+25-x

=> 9=(7-7)-(25-25)-x

=>9=0-0-x

=>9=-x

=>x=-9

Vậy x=-9