Trl :
Ko chắc
\(\left(7-x\right)-\left(25-7\right)=-25\)
\(\Rightarrow\left(7-x\right)-18=-25\)
\(\Rightarrow\left(7-x\right)=-25+18\)
\(\Rightarrow7-x=-7\)
\(\Rightarrow x=7-\left(-7\right)\)
\(\Rightarrow x=0\)
đúng rồi. thanks
(7-x)-(25+7)=-25
(7-x)-32 =-25
7-x =-25+32
7-x = +(32-25)
7-x = 7
x =7-7
x = 0
Vậy x = 0