Question

Answer 1

`<=> (7+x)/(8-x) = 8/7`

`<=> 64 - 8x = 49 + 7x`

`<=> 15 = 15x`

`<=> x=1`

Answer 2

\(\Leftrightarrow14\left(7+x\right)=16\left(8-x\right)\)

\(\Leftrightarrow98+14x-128+16x=0\)

\(\Leftrightarrow30x=30\)

\(\Leftrightarrow x=1\)

Answer 3

`(7+x)/(8-x)=16/14`

`=> (7+x).14= (8-x).16`

`=> 98 + 14x= 128 - 16x`

`=> 98-128=-16x-14x`

`=> -30= -30x`

`=>x=1`