Question

tìm x 215+7(x+1)=250

 

Answer 1

215+7(x+1)=250

7(x+1)=250-215

7(x+1)=35

x+1=35:7

x+1=5

x=5-1=4

Vậy x=4

Answer 2

\(215+7\left(x+1\right)=250\)

\(\Leftrightarrow7x+7=250-215\)

\(\Leftrightarrow7x+7=35\)

\(\Leftrightarrow7x=35-7\)

\(\Leftrightarrow7x=28\)

\(\Leftrightarrow x=28:7\)

\(\Leftrightarrow x=4\)