Question

Tìm x∈Z, biết:

-(38-x)-(37-x)=30-x

Answer 1

Ta có: \(-\left(38-x\right)-\left(37-x\right)=30-x\)

\(\Leftrightarrow-38+x-37+x-30+x=0\)

\(\Leftrightarrow3x-105=0\)

\(\Leftrightarrow3x=105\)

hay x=35

Vậy: x=35

Answer 2

-(38-x)-(37-x)=30-x

⇔-38+x-37+x=30-x

⇔x+x+x=30+38+37

⇔3x=105

⇔x=105 : 3

⇔x=35

Vậy x=35.

Answer 3