\(\dfrac{2+x}{5}-0,5x=\dfrac{1-2x}{4}+0,25\)
\(\Leftrightarrow\dfrac{2+x}{5}-\dfrac{x}{2}=\dfrac{1-2x}{4}+\dfrac{1}{4}\)
\(\Leftrightarrow\dfrac{2+x}{5}-\dfrac{x}{2}=\dfrac{1-2x+1}{4}\)
\(\Leftrightarrow\dfrac{2+x}{5}-\dfrac{x}{2}=\dfrac{2-2x}{4}\)
\(\Leftrightarrow\dfrac{2+x}{5}=\dfrac{1-x}{2}+\dfrac{x}{2}\)
\(\Leftrightarrow\dfrac{2+x}{5}=\dfrac{1-x+x}{2}\)
\(\Leftrightarrow\dfrac{2+x}{5}=\dfrac{1}{2}\)
\(\Leftrightarrow2\left(2+x\right)=5\\ \Leftrightarrow2x+4-5=0\\ \Leftrightarrow2x-1=0\\ \Leftrightarrow x=\dfrac{1}{2}\)
\(PT.\Rightarrow\) \(\dfrac{8+4x-10x-5+10x-5}{20}=0.\Rightarrow4x=2.\Leftrightarrow x=\dfrac{1}{2}.\)
\(\dfrac{2+x}{5}-0,5x=\dfrac{1-2x}{4}+0,25\\ \Leftrightarrow\dfrac{4.\left(2+x\right)}{20}-\dfrac{20.0,5x}{20}=\dfrac{5.\left(1-2x\right)}{20}+\dfrac{0,25.20}{20}\\ \Leftrightarrow8+4x-10x=5-10x+5\\ \Leftrightarrow4x=2\\ \Leftrightarrow x=\dfrac{1}{2}\\ \Rightarrow S=\left\{\dfrac{1}{2}\right\}\)
