Question

Solve: $\frac{3x-1}{5}-\frac{x}{7}=3$

Answer 1

$\frac{3x-1}{5}-\frac{x}{7}=3$

$\Rightarrow \frac{7(3x-1)-5x}{35}=3$

$\Rightarrow \frac{21x-7-5x}{35}=3$

$\Rightarrow 16x-7=105$

$\Rightarrow 16x=105+7$

$\Rightarrow 16x=112$

$\Rightarrow x=\frac{112}{16}=7$

$\therefore x=7$