Question

72–7(13–x)=14

Answer 1

72-7.(13-x)=14

=>7.(13-x)=72-14

=>7.(13-x)=58

=>13-x=58:7

=>13-x=\(\dfrac{58}{7}\)

\(=>x=13-\dfrac{58}{7}\)

\(=>x=\dfrac{33}{7}\)

Vậy ................

Answer 2

\(72-7(13-x)=14\)

\(7(13-x)=72-14\)

\(7(13-x)=58\)

\(13-x=58:7\)

\(13-x=\) \(\dfrac{58}{7}\)

\(x=13-\dfrac{58}{7}\)

\(x=\dfrac{33}{7}\)

Answer 3

\(72-7\left(13-x\right)=14\)

\(\Rightarrow72-91+7x-14=0\)

\(\Rightarrow7x=33\)

\(\Rightarrow x=\dfrac{33}{7}\)