Question

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Answer 1

$\it c)\ 1-\dfrac{1}{5}x=0,5|_{\cdot10} \Rightarrow 10-2x=5 \Rightarrow 10-5=2x \Rightarrow 5=2x|_{:2} \Rightarrow x=2,5\\ \\ \\ f)\ 5-2x=-2,6|_{\cdot5} \Rightarrow 25-10x=--13 \Rightarrow 25+13=10x \Rightarrow x=3,8$