Question 348639
Starting with:
{{{ 4/5-(v-1)/10=(v-5)/30 }}}
.
Multiply both sides by 30 to get rid of denominators:
{{{ 24 - 3(v-1) = v-5 }}}
{{{ 24 - (3v-3) = v-5 }}}
{{{ 24 - 3v +3  = v-5 }}}
{{{ 27 - 3v  = v-5 }}}
{{{ 27  = 4v-5 }}}
{{{ 32  = 4v }}}
{{{ 8  = v }}}