Question 487139


{{{7r=5r}}}...there is no solution; you do NOT have such a number {{{r}}} that makes {{{7r=5r}}} true 


{{{7r=5r}}}...here, you cancel {{{r}}} by dividing both sides by {{{r}}}

{{{7cross(r)=5cross(r)}}}...and you got {{{7=5}}} which is NOT true