\(2x+x:3-20=13.\left(98-26.3\right)\)
\(\Rightarrow2x+\dfrac{1}{3}x-20=13.\left(98-78\right)\)
\(\Rightarrow\dfrac{7}{3}x=13.20+20\)
\(\Rightarrow\dfrac{7}{3}x=20.\left(13+1\right)\)
\(\Rightarrow\dfrac{7}{3}x=20.14\Rightarrow\dfrac{7}{3}x=280\)
\(\Rightarrow x=280:\dfrac{7}{3}=120\)
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\(2x+x:3-20=13(98-26.3)\)
\(2x+x:3-20=13.20\)
\(2x+x:3-20=260\)
\(2x+x:3=280\)
\(x\left(2+\dfrac{1}{3}\right)=280\)
\(\dfrac{7}{3}x=280\)
\(x=120\)
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