Đáp án:
x+2/3 + 3(2x-1)- 5x-3/6 = x+5/13
⇔2/3+3(2x--1)-5x-3/6=5/13
⇔2/3+3(2x-1)-5x-3/2.3=5/13
⇔2/3+3(2x-1)-5x-1/2=5/13
⇔ $\frac{2.2.(3.2)(3(2x-1))-(3.2)(5x)+3.(-1)}{3.2}$= 5/13
⇔$\frac{4+6.3(2x-1)-6.5x-3}{3.2}$ =5/13
⇔$\frac{4+18(2x-1)-30x-3}{3.2}$=5/13
$\frac{18(2x-1)-30x+4-3)}{3.2}$ =5/13
$\frac{18(2x-1)-30x+1}{3.2}$=5/13
$\frac{36x-18-30x+1}{3.2}$ =5/13
$\frac{6x-17}{3.2}$ = 5/13
⇔13.(6x-17)=6.5
⇔13(6x-17)=30
⇔78x-221=30
⇔(78x-221)+221=30+221
⇔78x-221+221=251
⇔78x=251
⇔x=$\frac{251}{78}$
