Question

Daca \frac{x-1}{7} = \frac{4}{3,5} , atunci x= .... .

Answer 1

$\frac{x-1}{7} = \frac{8}{7} =\ \textgreater \ x-1=8=\ \textgreater \ x=9$

Answer 2

$\displaystyle \frac{x-1}{7} = \frac{4}{3,5} \Rightarrow 3,5(x-1)=4 \cdot 7 \Rightarrow 3,5x-3,5=28 \Leftrightarrow \\ \\ \Leftrightarrow 3,5x=28+3,5 \Rightarrow 3,5x=31,5 \Rightarrow x= \frac{31,5}{3,5} \Rightarrow x=9$