Question

 

y + 70y+70%y = -5,1y=−5,1

Answer 1

\(y+70y+70\%y=-5,1\)

\(\Leftrightarrow y\left(1+70+70\%\right)=-5,1\)

\(\Leftrightarrow y\left(1+70+\frac{70}{100}\right)=-5,1\)

\(\Leftrightarrow y\left(71+\frac{70}{100}\right)=-5,1\)

\(\Leftrightarrow y\left(\frac{710}{10}+\frac{7}{10}\right)=-5,1\)

\(\Leftrightarrow\frac{717}{10}x=-5,1\)

\(\Leftrightarrow x=-5,1\div\frac{717}{10}\)

\(\Leftrightarrow x=-5,1\times\frac{10}{717}\)

\(\Leftrightarrow x=\frac{-51}{717}\)