ta có 8.x = 78/10+25
<=> 25+39/5.x=8.x
=>25=8.x-39/5.x
=> 25=x.(8-39/5)
=> 25=x.1/5
=>x=25:1/5
=>x=25.5
=>x=125
Vậy x= 125
Ta có 8x=7,8x+25
8x - 7,8x =25
0,2x=25
x=12,5
<=> 8x - 7,8x = 25
<=> 0,2x = 25
<=> x = 25 : 0,2
<=> x = 125
\(8.x=7,8.x+25\)
<=>\(0,2.x=25\)
<=>\(x=125\)