Question 569640
i dont like fractions so first thing i do is multiply the denominators together
7y * 3 * 5 = 105y
now multiply everything by 105y
{{{(105y)(6/7y)-(105y)(1/3)=(105y)(1/5)}}}
{{{(15*cross(7y))(6/cross(7y))-(35y*cross(3))(1/cross(3))=(21y*cross(5))(1/cross(5))}}}

{{{(15*6)-(35y)=21y}}}
{{{90-35y=21y}}}add 35y to both sides
{{{90=56y}}} divide by 56
{{{90/56=y}}} reduce by 2
{{{45/28=y}}}