Question

giải pt:
80(x+3)=140x

Answer 1

\(80x-240=140x\)

\(-140x+80x=240\)

\(-20x=240\)

\(x=12\)

 

Answer 2

\(\Leftrightarrow80x+240=140x\\ \Leftrightarrow80x-140x+240=0\\ \Leftrightarrow-60x=-240\\ \Leftrightarrow x=4\)

Answer 3

\(x=4\)

Answer 4

<=> 80x +240 =140x
<=> 80x -140x =-240
<=> -60x          =-240
<=> x                =( -240 ) : ( -60 )
<=> x                =4
     Vậy.....